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• Can someone explain how a GUI works and when I should start using one?

  - by David

  I've been learning C++ for about a month now, and before I go any further, I'd like to clear up this tedious question I keep on having. I know what a GUI is, but I don't really know how it works, and maybe examples of popular ones...? Although I know command line programming is the bare fundamentals, I think it'd be fun messing around with a GUI. Although I have around 3 million other questions, I'll save them :D

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• shutdown bar is not appearing anywhere

  - by lokesh

  i am using ubuntu 11.10 in GNOME interface and there is no shutdown bar/option appearing on desktop . I have also used some solutions just like: sudo add-apt-repository ppa:webupd8team/gnome3 sudo apt-get update sudo apt-get install gnome-shell-extensions-alternative-status-menu but this is showing some error message in the terminal while typing last command. Please provided me with best solutions

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• I can't install libtiff on my 64-bit Ubuntu.

  - by marwa

  When I try to install libtiff on my 64-bit Ubuntu, I get the following error: sudo apt-get install libtiff Reading package lists... Done Building dependency tree Reading state information... Done Package libtiff is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libtiff' has no installation candidate ubuntu@ip-10-119-97-123:/mnt$ libtiff-memcached libtiff-memcached: command not found

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• How to mount a drive for other user than root?

  - by Ondra Žižka

  I've attached a SSD disk though USB. Then: sudo su - mkdir /mnt/hx chown ondra /mnt/hx mount /dev/sdb1 /mnt/hx # It's FAT32 now, but was the same with EXT4 The last command changes dir owner to root. Whenever I create a file in the root dir, I need to be root and root is the owner. Can I set different user as owner of the mounted dir? Or, simply said, ensure that user XY can freely read/write on the drive.

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• Swap Utilization: System Level Versus Individual Process

  - by Max

  On my top output, at header level, swap is showing 0k used. But on each individual process the SWAP is shown as a non-zero value (output column enabled with option p). What does this mean? Swap: 4870140k total, 0k used, 4870140k free, 571300k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ SWAP COMMAND 2448 max 20 0 323m 87m 27m S 0 4.4 1:23.31 236m chrome

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• Unable to run curl on on Ubuntu11.10

  - by ryy

  I ran : sudo apt-get install curl libcurl3 libcurl3-dev php5-curl Put: extension=php_curl.so in both /etc/php5/cli/php.ini and /etc/php5/apache2/php.ini But running php from the command line gives me the following error: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/php_curl.so' - /usr/lib/php5/20090626+lfs/php_curl.so: cannot open shared object file: No such file or directory in Unknown on line 0 Running the install commands again tells me that everything is already the newest version. Running: locate php_curl.so Returns nothing.

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• The Internet Key Wave MW833UP is not recognized in Ubuntu

  - by gio900

  I can't use my Onda MW833UP... :( Any advice? Here is something that someone else may understand: ~$: lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.10 Release: 11.10 Codename: oneiric ~$: lsusb Bus 001 Device 005: ID 1ee8:0012 ~$: dmesg [ 22.709475] cdc_acm 1-1:1.0: ttyACM0: USB ACM device [ 22.714856] usbcore: registered new interface driver cdc_acm [ 22.714866] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters [ 23.520490] ieee80211 phy0: wl_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement) [ 24.244530] usbcore: registered new interface driver usbserial [ 24.244575] USB Serial support registered for generic [ 24.244673] usbcore: registered new interface driver usbserial_generic [ 24.244681] usbserial: USB Serial Driver core [ 24.265879] USB Serial support registered for GSM modem (1-port) [ 24.285680] usbcore: registered new interface driver option [ 24.285691] option: v0.7.2:USB Driver for GSM modems [ 24.425878] EXT4-fs (sda9): re-mounted. Opts: errors=remount-ro,commit=600 [ 24.736540] EXT4-fs (sda8): re-mounted. Opts: commit=600 [ 35.705796] Easy slow down manager: checking for SABI support. [ 35.706002] Easy slow down manager: SABI is supported (f5189) [ 36.060099] usbcore: deregistering interface driver uvcvideo [ 139.508061] CE: hpet increased min_delta_ns to 20113 nsec [ 6798.378917] usb 1-1: USB disconnect, device number 5 [ 6809.108232] usb 1-1: new high speed USB device number 6 using ehci_hcd [ 6809.242692] scsi5 : usb-storage 1-1:1.0 [ 6810.241257] scsi 5:0:0:0: CD-ROM Onda Datacard CD-ROM 0001 PQ: 0 ANSI: 0 [ 6810.241841] scsi 5:0:0:1: Direct-Access Onda Storage 0001 PQ: 0 ANSI: 0 [ 6810.271410] sr0: scsi3-mmc drive: 0x/0x caddy [ 6810.272099] sr 5:0:0:0: Attached scsi CD-ROM sr0 [ 6810.272852] sr 5:0:0:0: Attached scsi generic sg1 type 5 [ 6810.279954] sd 5:0:0:1: [sdb] Attached SCSI removable disk [ 6810.281210] sd 5:0:0:1: Attached scsi generic sg2 type 0 [ 6810.380591] sr0: CDROM (ioctl) error, command: Xpwrite, Read disk info 51 00 00 00 00 00 00 00 02 00 [ 6810.380617] sr: Sense Key : Hardware Error [current] [ 6810.380625] sr: Add. Sense: No additional sense information [ 6810.613937] sr0: CDROM (ioctl) error, command: Xpwrite, Read disk info 51 00 00 00 00 00 00 00 02 00 [ 6810.613972] sr: Sense Key : Hardware Error [current] [ 6810.613984] sr: Add. Sense: No additional sense information [ 6810.673716] usb 1-1: USB disconnect, device number 6 [ 6815.572142] usb 1-1: new high speed USB device number 7 using ehci_hcd [ 6815.706828] cdc_acm 1-1:1.0: ttyACM0: USB ACM device The last 3 lines are where I inserted the Internet key, then reconnected it. usb-device T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 7 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=1ee8 ProdID=0012 Rev=00.01 S: Manufacturer=Onda S: Product=MW833UP S: SerialNumber=9230B35D870F9CB7AE684EACC5C12BE5EC33B26E C: #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=02 Prot=01 Driver=cdc_acm I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_acm Then there is /dev/ttyACM0. When the key is connected to the USB port, everything that will meant...

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• Apache / MySql is not running. What is wrong?

  - by Valeriu

  I installed lampp / xampp on my Ubuntu 12.04. After installing, Apache and MySQL were running properly. Now, they're not. Here's what I get when I try to run apache: Command: /etc/init.d/apache2 start Result: * Starting web server apache2 /usr/sbin/apache2ctl: 87: ulimit: error setting limit (Operation not permitted) (13)Permission denied: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs Action 'start' failed. The Apache error log may have more information.

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• How to integrate ubuntu one in pcmanfm (Lubuntu file manager)?

  - by mac

  I have installed ubuntu-one on a Lubuntu machine and indeed the file syncing works for all the folder that are shared. My problem is that while on my ubuntu machine I can right click a folder and mark it as shared, I could not find a way to do the same under pcmanfm. The only workaround I was able to find is to use the daemon via command-line: u1sdtool --create-folder . which works but is kind of clumsy.... any way to integrate in the GUI?

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• Problems in VLC Flickering

  - by Hutley

  I'm with problems at VLC. When I will go watch a movie, the video and sound be flickering I saw in some places that if i turn off the Compiz Animations it will works fine, but i dont want turn off the animations. Other solution that i saw was put in terminal the command: gstreamer-properties and set the video out to "X Window System (without Xv)" but this isnt working... Anyone have any idea how resolve this? Thanks..

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• Ubuntu 12.04 forgetting XModmap settings often

  - by PKKid

  I have the following contents in my ~/.Xmodmap file. It seems a couple times a day (without rebooting or logging out) I need to rerun the command "xmodmap ~/.Xmodmap" to reset my settings. The only thing I can think is that it seems to happen when I walk away from my computer for a bit. Maybe it forgets the settings when the computer locks itself? remove control = Control_L remove mod1 = Alt_L keycode 64 = Control_L keycode 37 = Alt_L add control = Control_L add mod1 = Alt_L Anyone else seeing similar issues?

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• Still prompted for a password after adding SSH public key to a server

  - by Nathan Arthur

  I'm attempting to setup a git repository on my Dreamhost web server by following the "Setup: For the Impatient" instructions here. I'm having difficulty setting up public key access to the server. After successfully creating my public key, I ran the following command: cat ~/.ssh/[MY KEY].pub | ssh [USER]@[MACHINE] "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys" ...replacing the appropriate placeholders with the correct values. Everything seemed to go through fine. The server asked for my password, and, as far as I can tell, executed the command. There is indeed a ~/.ssh/authorized_keys file on the server. The problem: When I try to SSH into the server, it still asks for my password. My understanding is that it shouldn't be asking for my password anymore. What am I missing? EDIT: SSH -v Log: Macbook:~ michaeleckert$ ssh -v [USER]@[SERVER URL] OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: /etc/ssh_config line 53: Applying options for * debug1: Connecting to [SERVER URL] [[SERVER IP]] port 22. debug1: Connection established. debug1: identity file /Users/michaeleckert/.ssh/id_rsa type -1 debug1: identity file /Users/michaeleckert/.ssh/id_rsa-cert type -1 debug1: identity file /Users/michaeleckert/.ssh/id_dsa type -1 debug1: identity file /Users/michaeleckert/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze3 debug1: match: OpenSSH_5.5p1 Debian-6+squeeze3 pat OpenSSH_5* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA [STRING OF NUMBERS AND LETTERS SEPARATED BY SEMI-COLONS] debug1: Host ‘[SERVER URL]' is known and matches the RSA host key. debug1: Found key in /Users/michaeleckert/.ssh/known_hosts:2 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/michaeleckert/.ssh/id_rsa debug1: Trying private key: /Users/michaeleckert/.ssh/id_dsa debug1: Next authentication method: password [USER]@[SERVER URL]'s password: debug1: Authentication succeeded (password). Authenticated to [SERVER URL] ([[SERVER IP]]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = en_US.UTF-8 Welcome to [SERVER URL] Any malicious and/or unauthorized activity is strictly forbidden. All activity may be logged by DreamHost Web Hosting. Last login: Sun Nov 3 12:04:21 2013 from [MY IP] [[SERVER NAME]]$

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• Shutdown/logoff script in Ubuntu 13.10

  - by TNT

  Which would be the best way to run a script upon GUI logoff, shutdown, hibernate, sleep modes? In 12.04 I think I did this in /etc/lightdm/lightdm.config, but on 13.10, the folder structure changed and when I create this script, The display manager wont even start upon boot. I am looking to implement a simple automatic truecrypt unmount command truecrypt -d but of course this would go for any script.

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• Multiplayer tile based movement synchronization

  - by Mars

  I have to synchronize the movement of multiple players over the Internet, and I'm trying to figure out the safest way to do that. The game is tile based, you can only move in 4 directions, and every move moves the sprite 32px (over time of course). Now, if I would simply send this move action to the server, which would broadcast it to all players, while the walk key is kept being pressed down, to keep walking, I have to take this next command, send it to the server, and to all clients, in time, or the movement won't be smooth anymore. I saw this in other games, and it can get ugly pretty quick, even without lag. So I'm wondering if this is even a viable option. This seems like a very good method for single player though, since it's easy, straight forward (, just take the next movement action in time and add it to a list), and you can easily add mouse movement (clicking on some tile), to add a path to a queue, that's walked along. The other thing that came to my mind was sending the information that someone started moving in some direction, and again once he stopped or changed the direction, together with the position, so that the sprite will appear at the correct position, or rather so that the position can be fixed if it's wrong. This should (hopefully) only make problems if someone really is lagging, in which case it's to be expected. For this to work out I'd need some kind of queue though, where incoming direction changes and stuff are saved, so the sprite knows where to go, after the current movement to the next tile is finished. This could actually work, but kinda sounds overcomplicated. Although it might be the only way to do this, without risk of stuttering. If a stop or direction change is received on the client side it's saved in a queue and the char keeps moving to the specified coordinates, before stopping or changing direction. If the new command comes in too late there'll be stuttering as well of course... I'm having a hard time deciding for a method, and I couldn't really find any examples for this yet. My main problem is keeping the tile movement smooth, which is why other topics regarding synchronization of pixel based movement aren't helping too much. What is the "standard" way to do this?

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• OpenJDK default options to always use the server VM

  - by montrealmike

  I got a warning message: jvm uses the client vm, make sure to run java with the server vm for best performance by adding -server to the command line In fact, when i run java -version i get: OpenJDK Runtime Environment (IcedTea7 2.3.2) (7u7-2.3.2a-0ubuntu0.12.04.1) OpenJDK Client VM (build 23.2-b09, mixed mode, sharing) How does one go about and change OpenJDK's defaults to always start under the server VM?

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• Software Center doesn't show files installed

  - by postfuturist

  When I install a program in the Software Center that happens to install a menu option, it is discoverable through the menu, but if it is a package that is documentation, or command-line only, there is no simple way to discover how to actually access the content / software. Is there a way in the Software Center to see what files or executables were installed with a particular package so I can actually use / read it?

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• Unable to locate Grizzly packages in Ubuntu 13.04 Server

  - by user162681

  I have installed Ubuntu 13.04 server in my x86 based laptop and then added the desktop packages on top of it. I have downloaded all the packages using apt-get. I have MySQL, PostgreSQL, Python 3.3, etc. But I am unable to locate Grizzly-specific Nova, Swift, and Glance packages (OpenStack). I am using this command: dpkg -l | grep Nova dpkg -l | grep Glance etc. Isn't Ubuntu 13.04 Server supposed to come with Grizzly automatically?

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• Kernel Panic Troubleshooting For Dummies

  - by iamsid

  I have made Ubuntu my primary OS since 10.04, and I have converted many of my friends and neighbors into Ubuntu users since then. I am the fix-it guy they approach when they encounter problems. The most frantic calls I get are when they encounter an "update-induced kernel panic." (Many human beings are allergic to command-line interfaces and search engines.) What are the step-by-step procedures to resolve an "update-induced kernel panic"?

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• What packages do I install for ffmpeg and libmp3lame?

  - by matt wilkie

  On my desktop Ubuntu 10.4 I use ffmpeg to convert videos to a format my dvd-player understands. On my laptop running 10.10 I can't get the same command to work, what package(s) are missing? ffmpeg -i infile.flv \ -threads 2 -vcodec mpeg4 -vtag divx -acodec libmp3lame -sameq \ outfile.avi #...snip Unknown encoder 'libmp3lame' Using apt-cache search libmp3lame I'm told there exist libmp3lame0 and libmp3lame-dev, both of which I've installed. Using acodec libmp3lame0 doesn't work either.

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• Ubuntu 12.04 - Wakes from Suspend by itself

  - by Peter

  This problem has only just started and I don't know what has changed to cause it. I suspend my ubuntu 12.04 PC and it used to stay asleep until I hit the enter key to wake it up but for the last week or so it's been waking itself up. I've checked the BIOS settings and all the Wake on Lan settings are Disabled. I've used the ethtool command and the wake on lan is set to "d" which I've read been off. Can anyone suggest anything?

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• Open Source Software Shortcut, Permanently Storing Macros in Vim

  <b>ServerWatch: </b>"A really useful feature of the open source editor Vim is the macro command, which allows you to record and reply a series of commands."

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• Argument list too long and copying to Samba Share

  - by Copy Run Start

  Ubuntu 12.04 LTS 64 bit. I'm trying to make a scheduled task copy from a directory with thousands of files to a samba share (while skipping duplicates). I mapped my Samba share through the GUI. The command I tried: cp /home/security/Brick/* ~/.gvfs/"cam on atm-bak-01.local/Brick" -n I found this but I don't know how to change the syntax to what I need. find -maxdepth 1 -name '*.prj' -exec mv -t ../prjshp {} + Any hints are greatly appreciated.

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• Ubuntu ONE (Windows BETA) locks up - What to do?

  - by Zusch

  OS: Windows XP SP3 Hardware: Dell Precision M4400 (Laptop) CPU: Core2Duo T9600 Mem: 4 GB Installer- setup, first start and account- setup of UbuntuONE Windows client passed with no problems. After restart of UbuntuONE, the CPU- usage shows 50% (100% core usage). Exit- command (from context-menu) hides the trayicon, but the program is still working excessive in background (50% cpu- / 50 MB memory- usage), until UbuntuOneClient.exe is killed by the taskmanager. What's going on ?

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• Oracle R Distribution 3.1.1 Released

  - by Sherry LaMonica-Oracle

  Oracle R Distribution version 3.1.1 has been released to Oracle's public yum today. R-3.1.1 (code name "Sock it to Me") is an update to R-3.1.0 that consists mainly of bug fixes. It also includes enhancements related to accessing package help files, improved accuracy when importing data with large integers, and better integration with RStudio graphics. The full list of new features and bug fixes is listed in the NEWS file.To install Oracle R Distribution using yum, follow the instructions in the Oracle R Enterprise Installation and Administration Guide.Installing using yum will resolve any operating system dependencies automatically. As such, we recommend using yum to install Oracle R Distribution. However, if yum is not available, you can install Oracle R Distribution RPMs directly using RPM commands.For Oracle Linux 5, the Oracle R Distribution RPMs are available in the Enterprise Linux Add-Ons repository:  R-3.1.1-1.el5.x86_64.rpm   R-core-3.1.1-1.el5.x86_64.rpm  R-devel-3.1.1-1.el5.x86_64.rpm  libRmath-3.1.1-1.el5.x86_64.rpm  libRmath-devel-3.1.1-1.el5.x86_64.rpm  libRmath-static-3.1.1-1.el5.x86_64.rpm For Oracle Linux 6, the Oracle R Distribution RPMs are available in the Oracle Linux Add-Ons repository:  R-3.1.1-1.el6.x86_64.rpm  R-core-3.1.1-1.el6.x86_64.rpm  R-devel-3.1.1-1.el6.x86_64.rpm  libRmath-3.1.1-1.el6.x86_64.rpm  libRmath-devel-3.1.1-1.el6.x86_64.rpm  libRmath-static-3.1.1-1.el6.x86_64.rpmFor example, this command installs the R 3.1.1 RPM on Oracle Linux x86-64 version 6:  rpm -i R-3.1.1-1.el6.x86_64.rpm To complete the Oracle R Distribution 3.1.1 installation, repeat this command for each of the 6 RPMs, resolving dependencies as required. Oracle R Distribution 3.1.1 is not yet officially certified with Oracle R Enterprise. Refer to Table 1-2 in the Oracle R Enterprise Installation Guide for supported configurations of Oracle R Enterprise components, or check this blog for updates. The Oracle R Distribution 3.1.1 binaries for Windows, AIX, Solaris SPARC and Solaris x86 will be available on OSS, Oracle's Open Source Software portal, in the coming weeks.

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• How can I set up the Trusty Desktop ISO for preseeding?

  - by user288087

  With Precise, I used to create a USB stick using the so-called "Alternate" installer DVD with my own preseed.txt, update isolinux/txt.cfg with a new menu item that would pass my preseed file on the command line, and watch as the installer happily did all the right things to create a Ubuntu install on the hard drive of the machine I booted. With Trusty, the 'alternate' image has disappeared. Is it still possible to preseed a Trusty install, and if so, how do I get the d-i/ubiquity system to use my preseed file?

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