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Articles indexed in May 2012

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  • Using static in PHP

    - by nischayn22
    I have a few functions in PHP that read data from functions in a class readUsername(int userId){ $reader = getReader(); return $reader->getname(userId); } readUserAddress(){ $reader = getReader(); return $reader->getaddress(userId); } All these make a call to getReader() { require_once("Reader.php"); static $reader = new Reader(); return $reader; } An overview of Reader class Reader{ getname(int id) { //if in-memory cache exists for this id return that //else get from db and cache it } getaddress(int id) { $this->getname(int id); //get address from name here } /*Other stuff*/ } Why is class Reader needed The Reader class does some in-memory caching of user details. So, I need only one object of class Reader and it will cache the user details instead of making multiple db calls. I am using static so that it the object gets created only once. Is this the right approach or should I do something else?

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  • How to install Eclipse in Ubuntu 12.04?

    - by Ant's
    I downloaded the Eclipse setup from their homepage. And I followed the instructions on this page. But I couldn't able to follow the last instruction, which ask me to do so : /opt/eclipse/eclipse -clean If do so, I get an error message like this : sudo: /opt/eclipse/eclipse: command not found But notably I can see the Eclipse Icon on my Dash Home (if I search for "Eclipse"). But clicking on that icon doesn't open the IDE. Where I'm making the mistake? And also running this command in terminal : eclipse throws this output: /usr/bin/eclipse: 5: /usr/bin/eclipse: /opt/eclipse/eclipse: Permission denied Thanks in advance.

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  • Why is my background image always disappearing when I log in?

    - by user64720
    When logging in lubuntu 12.04, my background image always disappears, leaving the screen with color only and then I have to go to definitions and set the image in the background again. I notice that this does not happen with low-resolution images, only with high ones, but also happens with images that fit my screen resolution (1280 X 720). Any ideas on how to fix this? The image remains at it's location, but on the desktop preferences, the pathway to the file location is lost and set to none.

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  • How can I set up a keyboard shortcut so that Ctrl+Backspace = Del?

    - by Palantir
    As an old mac user, I am used to hitting Ctrl+Backspace, and the effect is the same as if I pressed Del. I have recently purchased an Asus N53SV laptop which has replaced my MacBook, but unfortunately this laptop has a very annoying keyboard layout, where the Del key is in a non standard position, and moreover it is TINY. Is it possible to get the Ctrl+Backspace combination to issue a Del and how would I do this? Using Kubuntu, but I believe this is to be done at X level, not at desktop, am I right? Thanks!

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  • Notebook Dell Inspiron N5110 Overheating after Installing Ubuntu 12.04

    - by Gilberto Albino
    there! I am scared here! I am a Windows 7 User and decided to install Ubuntu 12.04 on my Notebook Dell Inspiron N5110 and when the Grub loads with the menu list the fan starts speeding up. If I choose windows the fan is noiseless but if I choose Ubuntu... Gosh!!! It continues speeding up and overheating... I'm very sad about that! Every time I try to use Linux... I get a diferent hardware issue related to incompatibility or bugs! When it's not graphic driver it is bug elsewhere unimaginable!!! If there is a solution for this... I wonder if someone could spend some time helping me out because... I have JUST bought this notebook because it is in the list of Certified Hardware: http://www.ubuntu.com/certification/hardware/201012-6931/ So this is sad and somehow disgusting! Linux is going for the wrong way! It's never gonna be popular while doesn't have so wide hardware support like WIndows! That's a pitty! It's very likely I won't get answered meanwhile I will switch back for windows! I prefer paying my Windows License and having a fully working system than having a free open source software that is about to explode my notebook or toast my hands before! So you linux wonderful guys help! I need somebody help (beattles so I won't cry)

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  • How can I improve overall system performance?

    - by Decio Lira
    What are your tips for improving overall system performance on ubuntu? Inspired by this question I realized that some default settings may be rather conservative on Ubuntu and that it's possible to tweak it with little or no risk if you wish to make it faster. This is not meant to be application specific (e.g. make firefox load pages faster), but system wide. Preferably 1 tip per answer, with enough detail for people to implement it. A couple of mine would be: Install Preload (via Software Center or sudo apt-get install preload); Change Swappiness value - "which controls the degree to which the kernel prefers to swap when it tries to free memory"; What are yours? PS: Since this is not intended to have a unique answer but rather, several useful tips, I'm making this community wiki out-of-the-box.

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  • How to package a file into .deb?

    - by Fluffy
    I'm trying to a make a simple .deb package, which would basically edit a config of another package I listed as a dependency. I added the required manipulations to the postinstall file. The problem is I can't find a way to package an example config, which should be copied and edited from the postinstall script. At the moment I just have a folder with the sample config, of which I'm creating a tar.gz and orig.tar.gz, then dh_make in that folder, edit the generated files and run debuild. However if I open the resulting .deb file with an archive manager, I can see that the sample file was not included at all.

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  • Black Login Screen after installing updates 12.04

    - by general_guts
    I love my lixux 12.04..till yesterday it installed new updates and i clicked on restart.. As system went to grub all normal & loaded normal..then instead of pretty desktop (auto login turned on) i have black screen asking for login and password.. Why? How i get my desktop back to before? Please help new noob!!! This is due to updates i am sure, nothing in hardware has changed and no other display settings changed.. using AMD diver from there site linux one for my raedeon 6850 and have catalyst driver working fine.. i have tried typing in weird commands but they didnt do much like sudo start lightdm and sudo startx .. didnt do anything just froze.. i dont exactly no what these commands do but something to do with black screen..so i thought id try it.. Thanks

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  • Bluetooth not really "turning on" on a Sony Vaio VPCEG

    - by marcioAlmada
    On a Sony Vaio VPCEG, bluetooth is not working properly: The gnome-shell bluetooth indicator (at the main bar) shows the bluetooth is on, but when I try to switch visibility on it simply doesn't turn on. When I open the bluetooth configuration dialog, the on/off indicator shows me the bluetooth is off. And when I try to turn it on it simply does not turn on. The following is outputted by lsusb command: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 003: ID 0c45:64be Microdia Bus 001 Device 004: ID 0489:e027 Foxconn / Hon Hai Bus 002 Device 014: ID 4971:ce22 SimpleTech ====== Update: Output from rfkill list: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: sony-wifi: Wireless LAN Soft blocked: no Hard blocked: no 2: sony-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no What should I do to really activate the bluetooth?

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  • How to create a "shutdown user" or "shutdown account"

    - by pcapademic
    Red Hat had a feature useful to me at the present time. There was an account, generally called "shutdown", and when you logged in with the account, the system shut down. In my specific case, I have Ubuntu Server running in a VM on my local system. The VM is running a web app, and when I'm done doing work, I want to shut down the VM. Unfortunately, I can't install VMware tools to get the "power button" based shutdown. Currently I login then sudo shutdown -h now, then type my password again, and things shutdown. Really, it's getting annoying all that waiting around and typing things. How do I replicate the "shutdown account" functionality in Ubuntu? A related question, were there any security gotchas that motivated people to stop using this kind of account?

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  • Login crash loop

    - by dawmail333
    After about the second/third batch of updates on a fresh install of Ubuntu 12.04, I end up getting stuck in an infinite login loop: I enter my password, screen goes black and shows me the end of the initialisation messages (including things like CUPS initialising), and then the greeter reappears. Kicker is, as I'm using gnome-shell, I just decided to uninstall LightDM, ubuntu-desktop and unity-greeter, using GDM as my manager, and the problem still happens in exactly the same manner. I'm lost even as to where to start looking - Xorg logs, LightDM logs (before I removed it), syslog and dmesg logs have held no unusual information at all. I have a TeX assignment due next week, and reinstalling Ubuntu every time I want to work on it is not going to work (nor is using TeX on Windows ;). Anything else I should try?

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  • lubuntu issues with desktop directory

    - by Hongxu Chen
    My lubuntu 12.04 is upgraded from the 11.10 version and I'm a Chinese user. What surprises me is that the directory shown on the initial screen is always changing! recently It seems to be mapped with the directory called w in my home directory(~). However when using pcmanfm to open the directory it usually shows odd string as to the name of the folder that cannot be print, which I think may be some Chinese characters.The directory also sometimes fails to appear in the window appeared first when logged in. I know the lxde has no conception of the shown folder and I think the lubuntu team has done some optimization. Can someone tell me what's happening?Thanks in advance.

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  • Disconnect have no effect using rdesktop

    - by Hongxu Chen
    So I'm using rdesktop with my labtop when I remote my PC in the lab,which is installed with Windows 7.Everything went well until I recently upgraded my lubuntu of the laptop(or maybe there's nothing with the upgrade at all,however I don't know).The rdesktop fails to disconnect when I disconnect from the start menu of Windows.This does not mean that I cannot return to my linux, actually I get back to lubuntu successfully and the terminal reports that I have disconnected.However when I re-login to Windows of the PC in the lab(via rdesktop) after I reboot my laptop, it fails.Then I come to the PC in the lab and the screen message tells me that it is still connected with my lubuntu. So what's the problem? Do any guys have similar experience? PC:Windows 7,in the lab;laptop:linux(lubuntu 12.04)

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  • How do I add text to an animated .gif in gimp?

    - by Carla
    I have just worked out how to create an animated.gif in gimp but I am having a problem adding text. When I create/add the text box and then save my.gif and view it, the text only flashes up over one frame/layer. How do I make the text last over the entire duration of the animated.gif? If you could explain in very simple terms, with the easiest solution, that would be wonderful as I am quite new to all this and very unsure of what I am doing! Thank you for any help you can give.

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  • Correct place to set $BIBINPUTS environment variable

    - by student
    If I set the $BIBINPUTS environment varibale in my .zshrc, it is recognized by emacs-reftex (via emacsclient), if I start emacs from my zsh commandline. However if I start using the menubar or gmrun it doesn't knot this variable. So where is the correct place to set for the whole user environment? If there are several alternatives, let me know. Also if it changed between differend ubuntu-versions. Edit: I have tried to set it in ~/.pam_environment like BSTINPUTS=.:/home/myuser/BiBTeX/:$BSTINPUTS BIBINPUTS=.:/home/myuser/BiBTeX/:$BIBINPUTS but it seems to have no effect (even after rebooting) and is not listed via printenv. I am currently using ubuntu natty + gdm + xmonad.

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  • How to install a Lexmark z600 series printer?

    - by Uri Herrera
    It has been a headache trying to install this printer. All the tutorials I found are for older versions of Ubuntu, and none of them work. How can I install this printer? Edit: HOWTO: Install PITA Lexmark Z600 Z615 and Dell Photo Printer 720 Setup Lexmark Z600 and X series printer on Ubuntu (i tried this one, only that it was translated to spanish, but it was the same instructions) HOWTO: Lexmark Printers I always get an error when extracting the converted tars with all of the tuts, invalid argument or the file doesn't exist. Looks like, i was missing some ia32 libs .. and that caused the errors with the tar files, anyways i still can't print now i get this, cups-insecure-filter How to install Lezmark Z600 series printer Here, the OP offers 2 debs, i installed them on a 32 bit Ubuntu install, now the printer gets recognized but still can't print, 'cause i'm missing a filter, "rastertoz600".

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  • Is it normal for 12.04 to occupy almost 4GB? Also, related questions

    - by Grant
    I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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  • How can I track a bug that caused a crash and was reported via apport / whoopsie?

    - by nealmcb
    It used to be that when a program crashed, especially when a user was using a pre-release of Ubuntu, apport could be used to open a bug report. The user could then track the bug, see if it affected others, help fix it, etc. As of Precise 12.04, this behavior and workflow changed. As I discovered in Bug #993450 “Apport fails to submit bug report”, by default apport no longer opens a bug report (and it is awkward but not impossible to get it to do so). At the same time people are noticing a new "whoopsie" process, as described at What is the 'whoopsie' process and what does it do?. After some more googling, I dug this blueprint up, which describes the whole process: ErrorTracker - Ubuntu Wiki. (It didn't mention whoopsie or daisy, so I added them - please correct me if I got it wrong). Wow - this sounds like great work to streamline and improve the crash reporting process. I'm left with this question: how does a user learn what the status of the problem is? The blueprint now has this requirement The user should have some way to check back on the status of their crash report; e.g. have some report ID they can look at to see statistics and/or any associated bug #. E.g. provide a serial number at time of filing that they can load via a web page later on. which seems unimplemented. Is there anything available in the meantime? And how does a developer get into the game? Going to https://daisy.ubuntu.com just provides an "Incorrect Content-Type" error message. Finally, I suggest documenting the apport behavior changes in the Release Notes. It should be of interest to anyone who has been trying to help out Ubuntu.

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  • sysctl.conf ignore net settings

    - by Steffen Unland
    I have a little problem with sysctl on a Ubuntu 10.04 LTS system. When I set the sysctl values with "sysctl -w " all work fine, but when I try to use the sysctl.conf file. the net settings will be ignored. For example my sysctl.conf # /etc/sysctl.conf - Configuration file for setting system variables kernel.domainname=findme.sysctl # Corefiles information fs.suid_dumpable=2 kernel.core_pattern=/cores/core-%e-%s-%u-%g-%p-%t ##############################################################3 # Functions previously found in netbase net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait=1 net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait=1 when I grep to the values, I can see that the sysctl settings for net.ipv4.netfilter don't set. [host:~ ] $ sysctl -a | grep domainname kernel.domainname = findme.sysctl [host:~ ] $ sysctl -a | grep "core_pattern" kernel.core_pattern = /cores/core-%e-%s-%u-%g-%p-%t [host:~ ] $ sysctl -a | grep "timeout_fin_wait" net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120 net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 120 [host:~ ] $ sysctl -a | grep "timeout_close_wait" net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60 net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 60 can somebody help me to solve the problem? If you need more information I can post it. Cheers, Steffen

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  • find . -type l says missing argument

    - by Sebi
    I want to find all symbolic links in the current directory and below. Therefore, I used: find . -type l Running that clears the screen showing "Pattern not found (press RETURN)" at the bottom of the screen. After pressing return, I get: find: missing argument to `-type' Here some system details: Ubuntu 10.04 LTS 64Bit zsh 4.3.10 (x86_64-unknown-linux-gnu) happens also in Screen version 4.00.03jw4 (FAU) 2-May-06 find (GNU findutils) 4.4.2 So how do I search for symbolic links so that I can grep in their names?

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  • Grub Won't Boot WIndows 7

    - by STavros P.
    I have a problem with Grub 2. when i hit the Windows 7 (loader) option on the Grub boot screen Windows won't boot. i get a black screen with a white cursor blinking... Here is a log of my Boot options. I just want to delete all the other partitions which i don't know how they 've been made and stay just with the Ubuntu ext4 partition, the swap partition and the WIndows 7 partition. Can someoune help me with my problem? Here is the log: http://paste.ubuntu.com/1014619/ ps: I can only boot Windows with Hiren's Boot CD with the first option, Boot form first hard drive (win7, xp, vista).

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  • OpenStack + Ubuntu 12.04

    - by csgeek
    Supposedly openstack can be installed easily under Ubuntu 12.04 LTS. I've installed 32 and 64bit versions of Ubuntu Server with the same behavior. sudo tasksel check OpenStack hit Okay then I get a tasksel: aptitude failed (100) I've seen: http://www.hastexo.com/resources/docs/installing-openstack-essex-20121-ubuntu-1204-precise-pangolin and https://github.com/EmilienM/doc-openstack documentation, but I was hoping that since it was an LTS released and it was an option in tasksel that I was simply overlooking something obvious and it's just a matter of selecting the right checkbox and hitting okay. Too much wishful thinking?

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  • Is it legal to ask photo ID and credit card copy in the U.S

    - by selim
    I regularly order from online shops around the world and I have not see any case where the company asks for photo ID or credit card copy. Yesterday I make an order from linode.com and my order is on hold because of their "fraud check system". Is it common to ask those info in U.S. where I have never asked such info in here (Istanbul, Turkey). And I already asked what is their motive and legal stand and the reason my order is hold by their fraud system. And I also added whether is because I live in Istanbul, Turkey. Their answer was as following: "We would not be able to disclose specific information related to our fraud system." And I'm asked repeatedly whether I want to cancel my order or not. I dont questioning reputation of linode.com if I think so, I did not make an order. I think asking for photo ID is neither legal nor provide any security.

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  • Appropriate response when client empowered with CMS destroys content to his own will

    - by dukeofgaming
    So, I just recently closed a website project that pretty much was The Oatmeals' Design Hell, but with content. The client loved the site at the beginning but started getting other people involved and mercilessly bombarding us with their opinions. We served a carefully thought content strategy (which the client approved) and extremely curated copywriting that took us four months after at least 5 requirement changes (new content, new objectives for the business, changed offerings, new mindfaps, etc.) that required us to rewrite the content about 3 times. The client never gave timely feedback even though we kept the process open for him and his people to see (content being developed transparently in Google Docs). Near the end of the project he still wanted to make changes but wanted us to finish already (there are not enough words in the world to even try to make sense of this). So I explained to him the obvious implications of the never-ending requirement changes and advised him to take the time to gather his thoughts with his own team and see the new content introduced as a new content maintenance project. He happily accepted, but on the day of training/delivery things went very wrong and we have no idea why. The client didn't even allow the site to be out for a week with the content we developed for him and quickly replaced us with a Joomla savvy intern so that he completely destroy the content with shallow, unstructured, tasteless and plain wordsmithing (and I'm not even being visceral). Worst insult of all, he revoked our access from his server and the deployed CMS not even having passed 10 minutes of being given his administrator account (we realized the day after that he did it in our own office, the nerve!). Everybody involved in the team is enraged and insulted. I never want to see this happen again. So, to try to make sense of this situation and avoid it in the future with new clients I have two concrete questions: Is there even an appropriate course of action with a client like this?, or is he just not worth the trouble of analyzing (blindly hoping this never repeats again). In the exercise to try and blame ourselves instead of the client and take this as a lesson of... something, how should we set expectations for new clients about the working terms, process and final product so that they are discouraged from mauling the content to their own contempt once they get the codes to the nukes (access to the CMS)?

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  • How to submit sitemap when your website has partial https? - Error: "Not in Domain"

    - by Ralph N
    My website is an ecommerce that is set up to do http for the item browsing portion, but https for things like shopping cart, contact us, etc.. (anything that has forms on it). I've submitted my website a long time ago to google webmaster tools as http://www.mywebsite.com. I also submitted a sitemap with about 40 links - 8 of them are https. I've noticed that for the longest time, google webmaster tools was reporting that 32 out of the 40 links have been crawled. I tested all the links against my robots.txt and realized that my robots text was blocking the https links. Google says those links are "Not In Domain". Is there a way i'm supposed to get around this so that I can have a hybrid-ssl site? I understand the concept that one site is mywebsite.com:80 and the other is mywebsite.com:443, but i'd like to avoid submitting and maintaining 2 seperate websites on google webmaster tools.

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