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• How do I stop my ethernet network connection from dropping?

  - by Sean Hill

  My ethernet-based network connection doesn't stay up consistently. I'm running a ping against the gateway and it will: Work for a minute Freeze, time out, or give multi-second response times Repeat If it's stuck and I disable/enable networking through the network manager applet everything will work fine again for a minute. After 280 packets transmitted I'm getting 41% packet loss. I've tried a different cable and connection to the gateway but this had no effect. The distance to the gateway is just about 3 feet. Seems to work fine if I switch over to Windows, but Ubuntu is my main OS and I can't even use it right now as I depend on the network. My setup... OS: Ubuntu 11.04, dual-booting Windows 7 Mobo: Gigabyte Z68X-UD4-B3 CPU: Intel Core i7 2600K Edit A little clarification... Network Manager is still showing me as connected, but I am unable to reach to gateway or anything beyond. At no point does NM suggest the connection is lost and calling ifconfig shows that I still have an IP address. I tried connecting to a different gateway with a different cable and the same problem arises. As requested: lspci | grep -i eth 07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) dmesg | tail -f [ 14.024709] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro,commit=0 [ 14.026443] EXT4-fs (sda7): re-mounted. Opts: commit=0 [ 14.176101] hda-intel: IRQ timing workaround is activated for card #2. Suggest a bigger bdl_pos_adj. [ 23.917731] eth0: no IPv6 routers present [ 726.109697] r8169 0000:07:00.0: eth0: link up [ 733.169494] r8169 0000:07:00.0: eth0: link up [ 753.930119] r8169 0000:07:00.0: eth0: link up [ 880.787332] r8169 0000:07:00.0: eth0: link up [ 1159.161283] r8169 0000:07:00.0: eth0: link up [ 1406.623550] r8169 0000:07:00.0: eth0: link up Edit @roland-taylor: Network is always available under Windows. Pings do not timeout, applications do not complain of no network availability, large downloads are not interrupted or slowed.

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• No GUI boot; startx error, I suspect no filesystem corruption.

  - by Dharmaj Soni

  Till yesterday, my Ubuntu 9.10 was working fine. I had watched a movie using vlc. I had also charged my ipod using the laptop. Today, when I started it, I automatically booted into command line. There seems to be no filesystem corruption etc as I can view/open (text) files. Before the CLI appeared, the screen blinked with a cursor, then the white Ubuntu logo flashed, and then I got the CLI login prompt. After logging in, if I try startx, to start gnome, I get the following error after a few seconds: giving up xinit: No such file or directory (errno 2): unable to connect to X server xinit: No such process (errno 3): Server error* The same error comes up, even if I use sudo, or if I change my directory to '/' before using startx, and also when, from the grub, using the recovery mode option to load into CLI, and then trying startx. On trying command 'xinit', I get "Server error" Also, on trying GDM, I get 2 errors. I cannot connect to the internet in this state. Thanks for any help. I am using Dell Inspiron 1440, no special graphics card.

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• How do I install a Wimax usb driver?

  - by kakaz

  I am using wimax usb modem in Ubuntu 9.04 properly. I am familiar with Ubuntu 10.04 and try to install the same deb file to use my wimax USB modem, but it could not install and give me the following error message: $ sudo dpkg -i green-packet-wimax-usb_i386.iso.deb (Reading database ... 206628 files and directories currently installed.) Preparing to replace green-packet-wimax-usb 1.12 (using green-packet-wimax- usb_i386.iso.deb) ... /var/lib/dpkg/info/green-packet-wimax-usb.prerm: 45: /etc/init.d/wimaxd: not found Removing any system startup links for /etc/init.d/wimaxd ... FATAL: Module mt7118_usb_os not found. Unpacking replacement green-packet-wimax-usb ... Setting up green-packet-wimax-usb (1.12) ... FATAL: Error inserting mt7118_usb_glue (/lib/modules/2.6.32-28-generic/kernel/drivers/net/mt7118_usb_glue.ko): Invalid module format dpkg: error processing green-packet-wimax-usb (--install): subprocess installed post-installation script returned error exit status 1 Processing triggers for ureadahead ... Processing triggers for desktop-file-utils ... Processing triggers for python-gmenu ... Rebuilding /usr/share/applications/desktop.en_US.utf8.cache... Processing triggers for libc-bin ... ldconfig deferred processing now taking place Processing triggers for python-support ... Errors were encountered while processing: The error (Line 9) give me some clue that the mt7118_usb_glue.ko kernel object can't insert it. So, I think this may be due to it's kernel dependencies. Can anybody tell me how I can install this kernel object to my new Ubuntu 10.04 kernel?

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• Interpreting Others' Source Code

  - by Maxpm

  Note: I am aware of this question. This question is a bit more specific and in-depth, however, focusing on reading the actual code rather than debugging it or asking the author. As a student in an introductory-level computer science class, my friends occasionally ask me to help them with their assignments. Programming is something I'm very proud of, so I'm always happy to oblige. However, I usually have difficulty interpreting their source code. Sometimes this is due to a strange or inconsistent style, sometimes it's due to strange design requirements specified in the assignment, and sometimes it's just due to my stupidity. In any case, I end up looking like an idiot staring at the screen for several minutes saying "Uh..." I usually check for the common errors first - missing semicolons or parentheses, using commas instead of extractor operators, etc. The trouble comes when that fails. I often can't step through with a debugger because it's a syntax error, and I often can't ask the author because he/she him/herself doesn't understand the design decisions. How do you typically read the source code of others? Do you read through the code from top-down, or do you follow each function as it's called? How do you know when to say "It's time to refactor?"

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• I cannot solve the "Install these packages without verification" problem

  - by Yonatan Orlev

  I Googled and Googled and I just cannot find a solution to this problem: sudo apt-get install <whatever> Gives me: WARNING: The following packages cannot be authenticated! and Install these packages without verification [y/N]? I cannot find a decent solution. The closest I got was to run: sudo apt-get install debian-keyring debian-archive-keyring But then, even thought, and against my good judgment I agreed to install the package without confirmation, I get: (I replaced http with XXXX because of forum limitations). Install these packages without verification [y/N]? y Err XXXX://il.archive.ubuntu.com gutsy/universe debian-archive-keyring 2007.02.19-0.1 404 Not Found Err XXXX://il.archive.ubuntu.com gutsy/universe debian-keyring 2005.05.28 404 Not Found Failed to fetch XXXX://il.archive.ubuntu.com/ubuntu/pool/universe/d/debian-archive-keyring/debian-archive-keyring_2007.02.19-0.1_all.deb 404 Not Found Failed to fetch XXXX://il.archive.ubuntu.com/ubuntu/pool/universe/d/debian-keyring/debian-keyring_2005.05.28_all.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? Trying to run apt-get update also does not help: I get tons of "404 Not Found" errors. Can someone please direct me to a good solution to this problem? I cannot understand why this issue is not better documented. There must be a simple solution which allows me to update my list of sources or whatever.

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• Why does Eclipse keep crashing and dpkg erroring out?

  - by Sanju Sony Kurian

  I AM GETTING THE ERROR E: Sub-process /usr/bin/dpkg returned an error code (1) WHILE I WAS TRYING TO UPGRADE MY PC. i USE ECLIPSE AND IT KEEPS ON CRASHING... pLEASE HELP I ATTACH THE ERROR sanju@sanju-Dell-System-XPS-L502X:~$ upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: aisleriot gir1.2-rb-3.0 gir1.2-totem-1.0 gnome-disk-utility gnome-keyring libgck-1-0 libgcr-3-1 libtotem0 linux-generic linux-headers-generic linux-image-generic rhythmbox rhythmbox-data rhythmbox-mozilla rhythmbox-plugin-cdrecorder rhythmbox-plugin-magnatune rhythmbox-plugin-zeitgeist rhythmbox-plugins seahorse totem totem-common totem-mozilla totem-plugins 0 upgraded, 0 newly installed, 0 to remove and 23 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Y Setting up grub-pc (1.99-21ubuntu3.1) ... /var/lib/dpkg/info/grub-pc.config: 35: /etc/default/grub: Syntax error: EOF in backquote substitution dpkg: error processing grub-pc (--configure): subprocess installed post-installation script returned error exit status 2 Errors were encountered while processing: grub-pc E: Sub-process /usr/bin/dpkg returned an error code (1)

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• Cross Apply Ambiguity

  - by Dave Ballantyne

  Cross apply (and outer apply)  are a very welcome addition to the TSQL language.  However, today after a few hours of head scratching, I have found an simple issue which could cause big big problems. What would you expect from this statement ? select * from sys.objects b join sys.objects a on a.object_id = object_id No prizes for guessing SQL server errors with “Ambiguous column name 'object_id'”. What would you expect from this statement ? Select * from sys.objects a cross apply( Select * from sys.objects b where b.object_id = object_id) as c Surprisingly, perhaps, the result is a cross join of sys.objects.  Well, what happened there ? If you look at the apply statement, within the where clause, only one of the conditions is qualified with a table name.  This meant that is has be interpreted as “b.object_id = b.object_id” causing the cross apply to have no join the the parent sys.objects table and causing the cross join. The fix is , obviously, simple Select * from sys.objects a cross apply( Select * from sys.objects b where b.object_id = a.object_id) as c So why no “Ambiguous column name ” error ?  I’ve raised a connect item on this issue here.

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• Why is Ubuntu's clock getting slower or faster?

  - by ændrük

  Ubuntu's clock is off by about a half hour: Where do I even start troubleshooting this? It's allegedly being set "automatically from the Internet". How can I verify that "the Internet" knows what time it is? Details Ubuntu has had plenty of time to communicate with the Internet: $ date; uptime Fri May 18 05:56:00 PDT 2012 05:56:00 up 12 days, 10:48, 2 users, load average: 0.61, 0.96, 1.15 This time server I found via a web search does appear to know the correct time: $ date; ntpdate -q north-america.pool.ntp.org Fri May 18 05:56:09 PDT 2012 server 208.38.65.37, stratum 2, offset 1752.625337, delay 0.10558 server 46.166.138.172, stratum 2, offset 1752.648597, delay 0.10629 server 205.189.158.228, stratum 3, offset 1752.672466, delay 0.11829 18 May 05:56:18 ntpdate[29752]: step time server 208.38.65.37 offset 1752.625337 sec There aren't any reported errors related to NTP: $ grep -ic ntp /var/log/syslog 0 After rebooting, the time was automatically corrected and the following appeared in /var/log/syslog: May 18 17:58:12 aux ntpdate[1891]: step time server 91.189.94.4 offset 1838.497277 sec A log of the offset reported by ntpdate reveals that the clock is drifting by about 9 seconds every hour: $ while true; do ntpdate-debian -q | tail -n 1 >> 'drift.log'; sleep 16m; done ^C $ r -e ' attach(read.table("drift.log", header=FALSE)) clock <- as.POSIXct(paste(V1, V2, V3), format="%d %b %H:%M:%S") fit <- lm(V10~clock) png("drift.png") plot(clock, V10, xlab="Clock time", ylab="Time server offset (s)") abline(fit) mtext(sprintf("Drift rate: %.2f s/hr", fit$coefficients[[2]]*3600)) '

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• nvidia graphics resolution problem

  - by Deepak Adhikari

  I am currently using ubuntu 12.04 I have acer aspire timelinex 3830tg with 2GB nvidia GeForce GT540M graphics card To enable my graphics card I followed following steps. 1.) I activated nvidia_current and nvidia_current_updates from additional drivers 2.) sudo nvidia-xconfig 3.) then reboot Following these steps I got following errors 1.) my resolution is 640x480...(there is no option of 1366x768 in display...previously there was 1366x768 when nvidia-xconfig command was not entered) 2.) when I open nvidia-settings it shows me following error "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run 'nvidia-xconfig' as root) and restart the X server." Problem need to be solved 1.) Change resolution to 1366x768 2.) Also how to check my nvidia graphics working or not Please some one please help me to solve these issues...I am seriously in need of my graphics card... I wan't my nvidia graphics card work as my intel graphics smoothly I am not willing to use bumblebee with regards, ubuntu user

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• Starting out with OpenGL when most tutorials are out of date

  - by AUTO

  I'm sure there are already a bunch of questions like this asked, but the constant updating of the OpenGL library throws them all away, and in a month or two, the answers here will be worthless again. I am ready to start programming in OpenGL using C++. I've got a working compiler (DevCpp; do NOT ask me to switch to VC++, and don't ask me why). Now I'm just looking for a solid tutorial on how to program with OpenGL. My assistant found the tutorial provided by NeHe Productions, but as I've come to find out, it's WAY OUT OF DATE! (although I did pull together a basic window to support an OpenGL canvas) Then I went online, and found the OpenGL SuperBible, which apparently uses freeglut? But what I'd like to know is whether or not SuperBible 5th edition is up to date any longer. The suggestion to freeglut I found said the latest version was 2.6.0 but now it's 2.8.0! Is the OpenGL SuperBible still a good, and fairly up-to-date place to start? Is there a better place to go to learn OpenGL? Am I allowed to simply store freeglut in the DevCpp include directory (maybe in GL), or is there some important procedure? Are there any comments or suggestions that I didn't think to ask since I'm only just beginning? @dreta cleared some things up for me, so now I have a better idea of what to ask: I think I'd like to start out with OpenGL using a wrapper library instead of directly accessing OpenGL.I just think that, for a beginner, it would be easier for me to program and get good results, while I don't yet have to understand all the grimy details (as @stephelton mentioned). The problem is, I can't find any library that doesn't have undefined references to no longer supported functions. Freeglut sounds operational, but it still uses GLU.Does anyone know what I can do?Also, I tried compiling the first SuperBible's source, but I got errors since GLAPI is not being defined as a type, the error originating in the GLU library. I'd like to use the SuperBible, but I don't know how to fix this.

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• I am trying to install Kubuntu, but I get a metalink error

  - by Brook Bentley

  It looks like the ISO metalink is broken for the Kubuntu install from Wubi. Can you please fix this? Or, help me figure out what I'm doing wrong. I receive the following error: 'An error occurred: Cannot download the metalink and therefore the ISO For more information, please see the log file: c:\users\bbentley\appdata\local\temp\wubi-12.04-rev269.log' The log file contains the following errors: '08-30 14:28 DEBUG TaskList: ### Running get_metalink... 08-30 14:28 DEBUG downloader: downloading http://releases.ubuntu.com/kubuntu/12.04/kubuntu-12.04-desktop-amd64.metalink > C:\ubuntu\install 08-30 14:28 ERROR CommonBackend: Cannot download metalink file err=[Errno 14] HTTP Error 404: Not Found 08-30 14:28 DEBUG downloader: downloading http://cdimage.ubuntu.com/kubuntu/daily-live/current/precise-desktop-amd64.metalink > C:\ubuntu\install 08-30 14:28 ERROR CommonBackend: Cannot download metalink file2 err=[Errno 14] HTTP Error 404: Not Found 08-30 14:28 DEBUG TaskList: ### Finished get_metalink 08-30 14:28 ERROR TaskList: Cannot download the metalink and therefore the ISO Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 595, in get_iso File "\lib\wubi\backends\common\backend.py", line 406, in download_iso Exception: Cannot download the metalink and therefore the ISO 08-30 14:28 DEBUG TaskList: # Cancelling tasklist 08-30 14:28 DEBUG TaskList: # Finished tasklist 08-30 14:28 ERROR root: Cannot download the metalink and therefore the ISO Traceback (most recent call last): File "\lib\wubi\application.py", line 58, in run File "\lib\wubi\application.py", line 132, in select_task File "\lib\wubi\application.py", line 158, in run_installer File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 595, in get_iso File "\lib\wubi\backends\common\backend.py", line 406, in download_iso Exception: Cannot download the metalink and therefore the ISO'

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• Attempting to install netgear N300 Wireless USB Adapter on Ubuntu without a present internet connection

  - by Liz

  Hello Linux/Ubuntu world out there. I don't have internet presently on the desktop I am trying to install the USB wireless adapter on. This seems to be the problem, which if the hardware would work would theoretically fix the problem. I can NOT access the internet via anything but wireless. I am presently on my laptop searching for answers while trying to install this little device. So any advice will have to take that into account. Now I have tried so far, using WINE which does not want to work, I have tried Windows Wireless Drivers which doesn't want to work, I have tried Software Sources, Other Software and it will not acknowledge the cdrom as a repository stating errors like E:Unable to stat the mount point /cdrom/ -stat (2: No such file or directory) However I can open the CD icon on my computer and access and browse the files. The computer can read the CD. I can read the CD. I've tried just plugging it in and seeing if the computer will automatically recognize the hardware, and go from there. That does not work either. I have tested USB port to just verify that the USB port works. It does. My laptop recognizes the hardware, and would easily install the software if I prompted it to. The difference is that my laptop is Vista, and I HATE Vista. Any tips, tricks?

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• PowerBroker (Likewise-Open) + Ubuntu 13.04 -> 13.10 Upgrade

  - by JoBu1324

  I just upgraded Ubuntu from 13.04 to 13.10, and now I can't log into Active Directory; my system is integrated using PowerBroker Identity Services (PBIS), which used to be called Likewise-Open. So far I have identified the following symptoms: I am able to log in with my credentials via ssh. The screen goes black when attempting log into my account via the login screen. I've tried leaving the domain, purging PBIS, and re-installing the latest version of PBIS. I've been trying the troubleshooting section I found here, but I haven't had any success. The relevant portion of the auth.log Oct 22 09:30:26 mypc lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "myusername" Oct 22 09:30:29 mypc lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm Oct 22 09:30:29 mypc lightdm: pam_unix(lightdm:session): session opened for user myusername by (uid=0) Oct 22 09:30:29 mypc lightdm: pam_unix(lightdm:session): session closed for user myusername Oct 22 09:30:30 mypc lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0) Oct 22 09:30:30 mypc systemd-logind[718]: New session c5 of user lightdm. Oct 22 09:30:30 mypc lightdm: pam_ck_connector(lightdm-greeter:session): nox11 mode, ignoring PAM_TTY :1 Oct 22 09:30:31 mypc dbus[535]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.129" (uid=110 pid=5139 comm="/usr/lib/x86_64-linux-gnu/indicator-keyboard-servi") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.39" (uid=0 pid=2024 comm="/usr/sbin/console-kit-daemon --no-daemon ") My .xsession-errors log Script for ibus started at run_im. Script for auto started at run_im. Script for default started at run_im. /usr/sbin/lightdm-session: 5: exec: init: not found

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• forcing upgrade or how to upgrade packages after update failed

  - by Orosjopie

  How do I continue upgrade or fix upgrade as upgrading in 13.04 to 13.10 failed. I'm currently running terminal in restore mode. I get the error unmet dependencies, but tried to install apt-get -f install, but get this error: unable to fetch some archives. using apt-get update also brings errors for example: failed to fetch http: archive.canonical.com/ubuntu/dists/quantal/release.gpg Could not resolve 'archive.canonical.com. Is it my internet connection? Its currently connected via a network cable and internet is on other computers. If internet on my ubuntu 13.10, how do I switch it on? or how can fix my upgrade problem that I can boot ubuntu normal, backup, then format and reload ubuntu 13.10 properly? I posted this problem that has also linked to this problem I mentioned: upgrading to ubuntu 13.10 failed/crashed. I did manager to install/upgrade some of the files and got ubuntu 13.10 to reboot, but not 100%, as it is slow and the unity desktop is not showing 100%. in trying some of the commands online, I get the error that the activity manager is not installed, when trying to install it, it conflicts with activity-log-manager-common. Please assist.

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• Cannot boot into ubuntu 12.10

  - by sriram

  Below given are the steps which I followed to install ubuntu 12.10 with existing windows 8 in my machine. I downloaded ubuntu 12.10 into my disk and made it bootable from my usb by selecting that iso file. Then restared my mahine and in BIOS I selected boot from usb. Went into Linux os and selected install ubuntu alongside windows 8. It asked for memory allocation and I selected 550 GB for Ubuntu and 404GB for Windows. After that it completed ubuntu installation. The booted into my windows 8 and used easyBCD to add a new entry. Ubuntu grup2 Now the easyBCD shows, There are a total of 4 entries listed in the bootloader. Default: Windows 8 Timeout: 10 seconds EasyBCD Boot Device: C:\ Entry #1 Name: Lenovo Recovery System BCD ID: {e58d0cb6-2eae-11e2-9d20-806e6f6e6963} Device: \Device\HarddiskVolume3 Bootloader Path: \EFI\Microsoft\Boot\LrsBootMgr.efi Entry #2 Name: EFI USB Device BCD ID: {e58d0cb5-2eae-11e2-9d20-806e6f6e6963} Device: Unknown Bootloader Path: Entry #3 Name: Windows 8 BCD ID: {current} Drive: C:\ Bootloader Path: \windows\system32\winload.efi Entry #4 Name: Ubuntu 12.10 BCD ID: {6f173570-3bce-11e2-be74-c0143dd589c0} Drive: C:\ Bootloader Path: \NST\AutoNeoGrub0.mbr Next I restarted my system and in the boot options it shows windows 8 and ubuntu 12.10 When I click on ubuntu it displays, \NST\AutoNeoGrub0.mbr status 0xc000007b The application or operating system cold not be loaded because a required file is missing or contains errors. Can you help me resolve this... Thanks :)

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• "Programming error" exceptions - Is my approach sound?

  - by Medo42

  I am currently trying to improve my use of exceptions, and found the important distinction between exceptions that signify programming errors (e.g. someone passed null as argument, or called a method on an object after it was disposed) and those that signify a failure in the operation that is not the caller's fault (e.g. an I/O exception). As far as I understand, it makes little sense for an immediate caller to actually handle programming error exceptions, he should instead assure that the preconditions are met. Only "outer" exception handlers at task boundaries should catch them, so they can keep the system running if a task fails. In order to ensure that client code can cleanly catch "failure" exceptions without catching error exceptions by mistake, I create my own exception classes for all failure exceptions now, and document them in the methods that throw them. I would make them checked exceptions in Java. Now I have a few questions: Before, I tried to document all exceptions that a method could throw, but that sometimes creates an unwiedly list that needs to be documented in every method up the call chain until you can show that the error won't happen. Instead, I document the preconditions in the summary / parameter descriptions and don't even mention what happens if they are not met. The idea is that people should not try to catch these exceptions explicitly anyway, so there is no need to document their types. Would you agree that this is enough? Going further, do you think all preconditions even need to be documented for every method? For example, calling methods in IDisposable objects after calling Dispose is an error, but since IDisposable is such a widely used interface, can I just assume a programmer will know this? A similar case is with reference type parameters where passing null makes no conceivable sense: Should I document "non-null" anyway? IMO, documentation should only cover things that are not obvious, but I am not sure where "obvious" ends.

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• Preventing Users From Copying Text From and Pasting It Into TextBoxes

  Many websites that support user accounts require users to enter an email address as part of the registration process. This email address is then used as the primary communication channel with the user. For instance, if the user forgets her password a new one can be generated and emailed to the address on file. But what if, when registering, a user enters an incorrect email address? Perhaps the user meant to enter [email protected], but accidentally transposed the first two letters, entering [email protected]. How can such typos be prevented? The only foolproof way to ensure that the user's entered email address is valid is to send them a validation email upon registering that includes a link that, when visited, activates their account. (This technique is discussed in detail in Examining ASP.NET's Membership, Roles, and Profile - Part 11.) The downside to using a validation email is that it adds one more step to the registration process, which will cause some people to bail out on the registration process. A simpler approach to lessening email entry errors is to have the user enter their email address twice, just like how most registration forms prompt users to enter their password twice. In fact, you may have seen registration pages that do just this. However, when I encounter such a registration page I usually avoid entering the email address twice, but instead enter it once and then copy and paste it from the first textbox into the second. This behavior circumvents the purpose of the two textboxes - any typo entered into the first textbox will be copied into the second. Using a bit of JavaScript it is possible to prevent most users from copying text from one textbox and pasting it into another, thereby requiring the user to type their email address into both textboxes. This article shows how to disable cut and paste between textboxes on a web page using the free jQuery library. Read on to learn more! Read More >

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• What's so bad about pointers in C++?

  - by Martin Beckett

  To continue the discussion in Why are pointers not recommended when coding with C++ Suppose you have a class that encapsulates objects which need some initialisation to be valid - like a network socket. // Blah manages some data and transmits it over a socket class socket; // forward declaration, so nice weak linkage. class blah { ... stuff TcpSocket *socket; } ~blah { // TcpSocket dtor handles disconnect delete socket; // or better, wrap it in a smart pointer } The ctor ensures that socket is marked NULL, then later in the code when I have the information to initialise the object. // initialising blah if ( !socket ) { // I know socket hasn't been created/connected // create it in a known initialised state and handle any errors // RAII is a good thing ! socket = new TcpSocket(ip,port); } // and when i actually need to use it if (socket) { // if socket exists then it must be connected and valid } This seems better than having the socket on the stack, having it created in some 'pending' state at program start and then having to continually check some isOK() or isConnected() function before every use. Additionally if TcpSocket ctor throws an exception it's a lot easier to handle at the point a Tcp connection is made rather than at program start. Obviously the socket is just an example, but I'm having a hard time thinking of when an encapsulated object with any sort of internal state shouldn't be created and initialised with new.

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• [Kubuntu 14.04][Eclipse] (ADT) crashes at button OK from Project properties

  - by nouseforname

  Since i upgraded to kubuntu 14.04, my Eclipse crashes at different situations. Mostly i can "simulate" it when going to project properties and press ok. Then it always crashes. My system: DISTRIB_ID=Ubuntu DISTRIB_RELEASE=14.04 DISTRIB_CODENAME=trusty DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS" My Java: java version "1.8.0_05" Java(TM) SE Runtime Environment (build 1.8.0_05-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode) My ADT Version: Android Development Toolkit Version: 23.0.0.1245622 I already tried to add this in adt-bundle-linux-x86_64/eclipse/configuration/configuration.ini org.eclipse.swt.browser.DefaultType=mozilla -Dorg.eclipse.swt.browser.DefaultType=mozilla Error: # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007fe049eb1718, pid=5964, tid=140601811232512 # # JRE version: Java(TM) SE Runtime Environment (8.0_05-b13) (build 1.8.0_05-b13) # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.5-b02 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [libgobject-2.0.so.0+0x19718] g_object_get_qdata+0x18 # # Core dump written. Default location: /home/maddin/core or core.5964 # # An error report file with more information is saved as: # /home/maddin/hs_err_pid5964.log Compiled method (nm) 28866 4166 n 0 org.eclipse.swt.internal.gtk.OS::_g_object_get_qdata (native) total in heap [0x00007fe051da6790,0x00007fe051da6af0] = 864 relocation [0x00007fe051da68b0,0x00007fe051da68f8] = 72 main code [0x00007fe051da6900,0x00007fe051da6ae8] = 488 oops [0x00007fe051da6ae8,0x00007fe051da6af0] = 8 # # If you would like to submit a bug report, please visit: # http://bugreport.sun.com/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # Now, as soon as i change SystemSettings - Application Apperance - GTK - GTKn-Design to something else but "oxygen-gtk" this crash doesn't happen anymore. But the application appearance also is ugly. Beside that i get a lot of errors/warnings like that: (SWT:6148): GLib-GObject-CRITICAL **: g_closure_add_invalidate_notifier: assertion 'closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS' failed or other GTK warnings from the particular design, not having theme-engine. Which actually doesn't cause any crahs it seems so far. So i have 3 options: accept crashes accept warnings (maybe the best choice) accept ugly design What can i do to solve this issue without changing the design settings?

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• How to make a btrfs snapshot?

  - by MountainX

  My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular. I am aware that there are similar questions, but each similar question seems to be asking something different from what I'm asking (and they are older, which means probably outdated, given the rapid development of btrfs). For example, the answer to this question is apparently not the answer to my question because my /home partition is a separate volume and the man page for btrfs shows a different command for creating snapshots now. another similar problem, no solid solution. someone else as confused as me on the naming issues My question: Starting simple: is this the correct command to take a simple snapshot of my home partition? btrfs subvolume snapshot /home/@home /home/@home_snapshot_20120421 I got really brave and tested it and it does not work. The error is error accessing /home/@home. As shown below, @home is listed. I'm obviously confused on subvolume names. Do I need to use them in creating snapshots? Some examples show taking snapshots of home using /home as the source parameter, but based on examples of root volumes, it seems to me that I need to use /home/@home. Would this command work? And if not, why? btrfs subvolume snapshot /home /home/@home_snapshot_20120421 Is the @ just a naming convention? Is it meaningful at all? Here's some output that may be relevant: btrfs subvolume list /home ID 256 top level 5 path @home I'm not sure what that means, exactly. When I try btrfs device scan it gives an error (e.g. unable to scan the device /dev/sda1). My file system doesn't have any errors. Everything is fine.

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• How do I install kivy?

  - by aspasia

  I was trying to install Kivy (by following the instructions here). I downloaded and installed all packages where the installation process went through without giving me any errors. However, when later I enter below command; sudo easy_install kivy It looked like it was going to work but it ends with an error by displaying following lines, which I don't comprehend: Detected compiler is unix /tmp/easy_install-BtOA_u/Kivy-1.8.0/kivy/graphics/texture.c:8:22: fatal error: pyconfig.h: No such file or directory #include "pyconfig.h" ^ compilation terminated. error: Setup script exited with error: command 'x86_64-linux-gnu-gcc' failed with exit status 1 I saw a similar question asked as; Problem with kivy installation. However, this didn't work for me though the question suggests installing libgles-mesa-dev-lts-raring which I did as below; sudo apt-get install libgles-mesa-dev-lts-raring which then gave below; E: Unable to locate package libgles-mesa-dev-lts-raring (sorry for being so specific and perhaps obvious, but I'm in the early stage of learning my way around linux). This user was running Ubuntu 12.04, and most other questions related to this I've seen came from people with a different release from mine, which has led me to believe that that is the reason why the suggestions to those didn't solve my problem. I'm using Ubuntu 13.10

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• Missing X-Spam-Status header

  - by Walt Stoneburner

  I recently upgraded to Ubuntu 14.04.1 LTS (trusty) and have followed the directions in https://help.ubuntu.com/14.04/serverguide/mail-filtering.html and am sending and receiving mail just fine. While I do see X-Virus-Scanned headers in my messages, which suggests mail is indeed being processed, I do not see any X-Spam-Level or X-Spam-Score headers being added to messages. This makes downstream procmailrc and client-side filtering ...more difficult. While having $final_spam_destiny = D_DISCARD in /etc/amavis/conf.d/20-debian_defaults does greatly reduce spam to my inbox, I had concerns of false-positives prior to tuning and didn't know were there going, so have set it to D_PASS for the time being. This exposed the problem. I'm not sure where to look to start diagnosing the problem (otherwise I'd post a suspect configuration file). /etc/amavis/conf.d/15-content_filter_mode has the lines uncommented to enable virus and spam checks, and virus checking appears to be working according to the headers. Spam Assassin certainly seems to be starting just fine, too. SpamAssassin debug facilities: info SA info: zoom: able to use 360/360 'body_0' compiled rules (100%) SpamAssassin loaded plugins: AskDNS, AutoLearnThreshold, Bayes, BodyEval, Check, DKIM, DNSEval, FreeMail, HTMLEval, HTTPSMismatch, Hashcash, HeaderEval, ImageInfo, MIMEEval, MIMEHeader, Pyzor, Razor2, RelayEval, ReplaceTags, Rule2XSBody, SPF, SpamCop, URIDNSBL, URIDetail, URIEval, VBounce, WLBLEval, WhiteListSubject SpamControl: init_pre_fork on SpamAssassin done I've also set $log_level = 2; in /etc/amavis/conf.d/50-user and don't see any obvious errors rolling by in the logs. Q: Any recommendations of what to try next? UPDATE (it appears that I have the right setting already): /etc/amavis/conf.d$ grep sa_tag_level_deflt * 20-debian_defaults:# $sa_tag_level_deflt = 2.0; # add spam info headers if at, or above that level 20-debian_defaults:$sa_tag_level_deflt = -999; # add spam info headers if at, or above that level

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• Avoiding Object Oriented Pitfalls, Migrating from C, What Worked for You?

  - by Stephen

  I've been programming in procedural languages for quite some time now, and my first reaction to a problem is to start breaking it down into tasks to perform rather than to consider the different entities (objects) that exist and their relationships. I have had a university course in OOP, and understand the fundamentals of encapsulation, data abstraction, polymorphism, modularity and inheritance. I read Learning to think in the Object Oriented Way and Learning object oriented thinking, and will be looking at some of the books pointed to in those answers. I think that several of my medium to large sized projects will benefit from effective use of OOP but as a novice I would like to avoid time consuming, common errors. Based on your experiences, what are these pitfalls and what are reasonable ways around them? If you could explain why they are pitfalls, and how your suggestion is effective in addressing the issue it'd be appreciated. I'm thinking along the lines of something like "Is it common to have a fair number of observer and modifier methods and use private variables or are there techniques for consolidating/reducing them?" I'm not worried about using C++ as a pure OO language, if there are good reasons to mix methods. (Reminiscent of the reasons to use GOTOs, albeit sparingly.) Thank you!

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• Workaround for an Xcode/iOS SDK Issue...

  - by Joe Huang

  Hi, everyone: When you are doing ADF Mobile development, and you need to deploy the application to an iOS device, you would need to compile/deploy the app with iOS App Certificates and Provisioning Profile. This means you would need to "Deploy to Package" or "Deploy to iTunes" during deployment, and configure JDeveloper with the proper certificates/profiles. In some instances (exact combination is still not clear), deploy and signing the application to generate the ipa file may fail with similar error message at the end of the deployment log: [01:04:45 PM] Deployment failed due to one or more errors returned by '/usr/bin/xcrun'. The following is a summary of the returned error(s): Command-line execution failed (Return code: 1) error: /usr/bin/codesign --force --preserve-metadata=identifier,entitlements,resource-rules --sign iPhone Distribution: Oracle Corporation --resource-rules=/var/folders/x7/21sjrpx13qj9tq20z14s3j_w0000gn/T/tkROhP11qU/Payload/HelloWorld.app/ResourceRules.plist --entitlements /var/folders/x7/21sjrpx13qj9tq20z14s3j_w0000gn/T/tkROhP11qU/entitlements_plistEINPBkIG /var/folders/x7/21sjrpx13qj9tq20z14s3j_w0000gn/T/tkROhP11qU/Payload/HelloWorld.app failed with error 1. Output: /var/folders/x7/21sjrpx13qj9tq20z14s3j_w0000gn/T/tkROhP11qU/Payload/HelloWorld.app: replacing existing signature Program /usr/bin/codesign returned 1 : [/var/folders/x7/21sjrpx13qj9tq20z14s3j_w0000gn/T/tkROhP11qU/Payload/HelloWorld.app: replacing existing signature This issue is a known issue and is not related to ADF Mobile. The workaround is discussed in this article from StackOverflow. This article refers to the old location of Xcode, so you would need to adjust the paths accordingly. The path for Xcode 4.3 and above would be like: /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/PackageApplication to this script file. To modify it, you probably can’t use Text Editor. I end up opening a terminal session, changed the file permission, and used vi to update it. Thanks, Oracle ADF Mobile Product Management Team

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• CodeStock 2012 Review: Eric Landes( @ericlandes ) - Automated Tests in to automated Builds! How to put the right type of automated tests in to the right automated builds.

  Automated Tests in to automated Builds! How to put the right type of automated tests in to the right automated builds.Speaker: Eric LandesTwitter: @ericlandesBlog: http://ericlandes.com/ This was one of the first sessions I attended during CodeStock 2012. Eric’s talk focused mostly on unit testing, and that the lack of proper unit testing can be compared to stealing from an employer. His point was that if you’re not doing proper unit testing then all of the time wasted on fixing issues that could have been detected with unit tests is like stealing money from employer. He makes the assumption that that time spent on fixing these issues could have been better spent developing new features that drive the business. To a point I can agree with Eric’s argument regarding unit testing and stealing from a company’s perspective. I can see how he relates resources being shifted from new development to bug fixes as stealing based on the fact that the resources used to fix bugs are directly taken from other projects. He also states that Boring/Redundant and Build/Test tasks should be automated because it reduces the changes of errors and frees up developer to do what they do best, DEVELOP! When he refers to testing, he breaks testing down in to four distinct types. Unit Test Acceptance Test (This also includes Integration Tests) Performance Test UI Test With this he also recommends that developers should not go buck wild striving for 100% code coverage because some test my not provide a great return on investment. In his experience he recommends that 70% test coverage was a very acceptable rate.

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