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• TG'10 Conference Set

  Meeting of the nation's largest and most-comprehensive distributed cyberinfrastructure for open scientific research will take place August 2-5 Research - Computer Science - Cyberinfrastructure - National Science Foundation - Organizations

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• Why is my laptop so sluggish? Or Damn You Facebook and Twitter! Or All Hail Chrome!

  - by John Conwell

  In the past three weeks, I've noticed that my laptop (dual core 2.1GHz, 2Gb RAM) has become amazingly sluggish.  I only uses for communications and data lookup workflows, so the slowness was tolerable.  But today I finally got fed up with the suckyness and decided to get to the root of the problem (I do have strong performance roots after all). It actually didn't take all that long to figure it out.  About a year ago I converted to Google Chrome (away from FireFox).  One of the great tools Chrome has is a "Task Manager" tool, that gives you Windows Task Manager like details for all the tabs open in the browser (Shift + Esc).  Since every tab runs in its own process, its easy from Task Manager (both Windows or Chrome) to identify and kill a single performance offending tab.  This is unlike IE, where you only get aggregate data about all tabs open.  Anyway, I digress.  Today my laptop sucked.  Windows Task Manager told me that I had two memory hogging Chrome tabs, but couldn't tell me which web page those tabs are showing.  Enter Chrome Task Manager which tells you the page title, along with CPU, memory and network utilization of each tab.  Enter my amazement.  Turns out Facebook was using just shy of half a Gb of RAM.  Half a Gigabyte!  That's 512 Megabytes!524,288 Kilobytes! 536,870,912 Bytes!  Or 4,294,967,296 Bits!  In other words, that's a frackin boat load of memory.  Now consider that Facebook is running on pretty much 96.3% (statistics based on absolutely nothing) of every house hold desktop, laptop, netbook, and mobile device in America, that is pretty horrific! And I wasn't playing any Facebook games like FarmWars or MafiaVille.  I just had my normal, default home page up showing me who just had breakfast, or just got finished with their morning run. I'm sorry...let me say that again...HALF A GIG OF RAM!  That is just unforgivable. I can just see my mom calling me up:  Mom: "John...I think I need a new computer.  Mine is really slow these days" John: "What do you have running?" Mom: "Oh, just Facebook" John: "Ok, close Facebook and tell me how fast your computer feels" Mom: "Well...I don't know how fast it is.  All I do is use Facebook" John: "Ok Mom, I'll send you a new computer by Tuesday" Oh yea...and the other offending web page?  It was Twitter, using a quarter of a Gigabyte. God I love social networks!

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• Choppy/unresponsive keyboard and mouse pointer until suspend

  - by Stefan Thyberg

  I had a problem where my mouse and keyboard would be choppy, the mouse pointer would work at 1-2 fps and the keyboard would keep missing letters as I was typing them. Since they were both USB I suspected there was a problem there immediately. Whenever I got this problem I would suspend the computer and start it again and the problem would be gone. The problem started appearing when I plugged the mouse and keyboard directly into the computer rather than the USB hub in the screen. I'm using a Logitech UltraX Flat and a Razer Lachesis, but I'm not sure if that matters.

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• Ubuntu will not start due to full partitions

  - by mike

  I left my computer downloading all the night and I did download 35 GB of movies (legal ...). I restarted the computed in the morning then I booted in my encrypted Windows partition for my work. I have left my computer downloading 35GB of files and when I restarted in the morning, I booted Windows. When I tried to access Ubuntu, it failed to boot and in low-graphic mode told me that it won't boot because the partition is full. I tried rescue and it reported 0 MB free. I also cannot delete files with sudo rm as all are impossible due to a read-only file system. I can mount it in Windows but there is a "write protection" there, also. Should I try a live USB?

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• How to obtain a list of installed packages based on a backup?

  - by ujjain

  I have made a backup of my entire computer and I reinstalled the OS right now. I know I should have listed dpkg -l to obtain a list of packages, but I have not done so. I only made a tarball of the entire disk. I wonder how I can find a list of packages based on this data. I would like to have the same packages installed that I had on my previous set-up. But there seems no longer a way to gain a list of packages, since I already reinstalled Ubuntu on the computer and only have the tarball back-up.

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• Ubuntu 12.04 wired ethernet not working and wireless not working, How do I fix it?

  - by Eloy

  I am new to ubuntu. I recently installed the latest ubuntu for desktop from http://www.ubuntu.com/download. I was very excited to start using ubuntu until I booted the computer and saw that i couldn't connect to the internet at all. I have spent hours trying to figure this out. I keep running into people suggesting installing drivers etc. I have tried about everything and nothing seems to work. I have the ethernet cable connected to the computer but it doesn't recognize it. I ran the following: lspci | grep -i eth and I get this 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express (rev 02) Any help would be much appreciated. I am kind of bummed I have spent all this time tyring to get the internet to work and haven't even gotten to use the power of ubuntu Update copied from comment: Changing the Ethernet cable to a different one fixed the problem.

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• Ubuntu 14.04 doesn't detect my discrete GPU

  - by user258887

  I recently purchased a laptop with an Nvidia GeForce 860m, and have installed Ubuntu 14.04. On my old laptop I had 12.04, which automatically filled Additional Drivers with Nvidia drivers. But on this computer, the only thing in Additional Drivers is Qualcomm. So I manually installed Nvidia, but X Server Settings doesn't seem to detect any GPU... lspci | grep VGA reports only my integrated Intel GPU, but lspci -v reports many things, including the Nvidia GPU: 01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 860M] (rev a2) Subsystem: ASUSTeK Computer Inc. Device 157d Flags: fast devsel, IRQ 16 Memory at ec000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0000000 (64-bit, prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at ed000000 [disabled] [size=512K] Capabilities: access denied Don't know what any of that means. Not sure if it's supposed to say 'access denied'... I need my GPU to do CUDA and OpenGL programming. What else can I do to figure out why this isn't working?

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• Monitor displays "No VGA signal" "Check DVI cable" after installing motherboard drivers

  - by user1604220

  I bought computer with all of the needed parts, got everything sorted out, installed windows 7 but my CD-ROM doesn't fit my motherboard. So I had to download the driver manually and install it using USB disc. My motherboard: ECS elitegroup H61H2-M2, I downloaded it's drivers, installed the BIOS map or something, and then the computer forced a reboot after it was complete, after the reboot my monitor just stopped working and displayed No VGA signal, No DVI cable I think I've just installed the wrong driver, well but how can I sort it out? This is the driver I installed. On the book, it tells me to install the drivers, without the driver it won't see the Internet connection cable. I'm 100% sure there is nothing wrong with the monitor or it's cables. it stopped working exactly after the reboot after the installation.

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• Sound card stop responding

  - by Merianos Nikos

  A few days ago I installed the latest version of Ubuntu in a computer of mine, that it has installed the "Sound Blaster Audigy 2ZS". After the installation and up to yesterday everything was excelent. Yesterday I installed the latest Ubuntu updates and today I had several issues. First the mouse was not responed as should be, but after restarted my computer everything was fine with mouse. Next was my sound card. For now I do not have sound at all :( I don't really know what's wrong. Does anybody has any idea on how to solve that issue, or from where to start, to find a solution ? If there is no any available solution for that issue, can I remove the latest updates that installed yesterday ? Kind regards Merianos Nikos

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• Flashing task bar(firefox) in lxde panel and ubuntu internal error

  - by arroy_0209

  I have upgraded from ubuntu10.04 to 12.04 and installed lxde. The panel is now customized according to my convenience. The problem is there was a default checked option for "Flash when there is any window requiring attention" in Task bar(window list) and now when I run firefox, at times the concerned bar in the panel window list starts flashing but it is not clear exactly why at that moment firefox requires my attention. Normally this happens after I download some files (pdf files) and keep using firefox. The only solution I have found is to quit firefox and even after that I receive this message "Sorry, ubuntu12.04 has experienced an internal error. If you notice further problems, try restarting the computer." As usual I report the detailed message to ubuntu as suggested and finally restart the computer. So there are two problems, first, exactly why firefox needs my attention at times and second, why immediately after this, ubuntu experiences an internal error. Please suggest what I should do.

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• Crontab opens as blank page, cannot save

  - by Sarah

  I am really not familiar with linux, and only started using it recently, so be patient with me. I am trying to control a camera on regular intervals through a script that is called upon in the crontab. When I start up the computer, I can open crontab, edit and save, and everything is executed correctly. However, I can never open crontab a second time, unless I restart the computer first. If I type crontab -e, I get a blank page, located in the /tmp directory. I can enter my commands in there, but cannot save it. I don't know if this is relevant, but when I try sudo crontab -e, I get something like "no cron installed for root". Any help is really appreciated! Sarah

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• How to remove Ubunto from boot screen?

  - by Alaa M.

  I tried to install Ubuntu 14.04 on my Windows 8, and in the installation wizard I chose "Help me boot from CD". Now I have something like this when I restart the computer: http://i.stack.imgur.com/HxDQr.png If I click Ubuntu I get an error about a missing file (wubildr.mbr). I found a solution here. But that's not my concern now. I don't know if that means I have Ubuntu installed on my computer now or not, but I wanna delete it from the boot screen. I figured that I need to delete its partition, so I went to Disk Management and found the following: http://i.stack.imgur.com/W0oP4.png My question is: which one should I delete?

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• System doesn't boot when ubuntu is installed on an SSD

  - by Caetano Nichnich Nunes

  I've recently discovered Ubuntu and decided to give it a try. I am using a Samsung Series 5 p530u3c-ad1 which comes with a 24gb SSD and a ~500gb HDD, My intention is to set the system files to the ssd and the rest to the HDD. The system works fine if I do a direct install using only the HDD, but if I try using the SSD for the system files the computer doesn't boot-up, I do not know if the SSD is being recognized by the computer, I think so because I could install Ubuntu on it, but it doesn't appear on the boot order or the boot menu. I read some posts and tried using boot-repair which pointed me not to forget to set my system to boot from my SSD, unfortunately I cannot because of the issues mentioned above. Thanks for your time.

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• 7-Zip - A Free alternative to other compression utilities

  - by TATWORTH

  At http://www.7-zip.org/download.html, there is a free alternative other compression utilities. It handles a wide variety of formats including RAR!Here is the description from its home page:License 7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. The main features of 7-Zip High compression ratio in 7z format with LZMA and LZMA2 compressionSupported formats: Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIMUnpacking only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z. For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZipStrong AES-256 encryption in 7z and ZIP formatsSelf-extracting capability for 7z formatIntegration with Windows ShellPowerful File ManagerPowerful command line versionPlugin for FAR ManagerLocalizations for 79 languages

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• An "Invoke Update Manager to update everything and shutdown" script after idle for x minutes?

  - by unknownthreat

  I have Ubuntu 10.10 installed on a machine for my parents. The thing is they never request updates from Update Manager even the manager itself prompted them so. Moreover, when they are done with whatever they are doing on Ubuntu, they always leave the computer on. And I always have to come back and shut the machine down. Sometimes, the computer even sit idle for hours. So I want to know whether this is possible in Ubuntu. I am thinking of a script that will be activated after the machine is idle for x minutes. When x minutes have elapsed, Update Manager will automatically update everything listed. (I recall that you need the admin password for this, so is there a workaround?) After all the updates are done, the machine will automatically shutdown. Is this possible?

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• HTG Explains: Should You Shut Down, Sleep, or Hibernate Your Laptop?

  - by Chris Hoffman

  Computers can sleep, hibernate, or shut down. Sleep allows you to quickly resume using your laptop at the cost of some electricity. Hibernate is like shutting down your computer, but you can still resume working where you left off. There’s no right answer in all situations. Some people leave their computers running 24/7, while others shut down computers the moment they step away. Each of these options has its advantages and disadvantages. Image Credit: DeclanTM on Flickr 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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• Mouse and keyboard stop working after suspend or screensaver lock

  - by LEo

  If I leave the computer and let it run into screensaver and lock the screen, the mouse left click won't go back to work. If I suspend the computer, the keyboard won't get back to work. It started after upgrading to Ubuntu 11.04. Any tips to solve this problem? The follwing lines I got on dmesg after the problem happened [30536.564415] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.565725] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.568466] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.569790] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.571123] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.571126] psmouse.c: issuing reconnect request and that after I tried to plug again my USB mouse: [31570.040088] usb 6-1: USB disconnect, address 2 [31573.490095] usb 6-1: new low speed USB device using uhci_hcd and address 3 [31573.687376] input: Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb6/6-1/6-1:1.0/input/input12 [31573.687544] generic-usb 0003:045E:0084.0002: input,hidraw0: USB HID v1.10 Mouse [Microsoft Basic Optical Mouse] on usb-0000:00:1d.1-1/input0

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• Self-Scaling Architecture for Group and Enterprise Computing

  Better computing and communication for emergency personnel at disaster sites Computing - Business - Computer Science - Distributed Computing - Cloud computing

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• Update Errors in Xubuntu 12.10

  - by wil

  I updated by computer from 12.04 to 12.10 and after I finished updating when I turned on my computer I am unable to update my computer. I tried install a new copy of 13.04 but my cpu doesn't support pae. I have a IBM Thinkpad T42 with a 1.7 gigahertx Cpu. When updating through terminal This is the output. sudo apt-get upgrade: [sudo] password for wil: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: linux-image-extra-3.5.0-34-generic : Depends: linux-image-3.5.0-34-generic but it is not installed linux-image-generic : Depends: linux-image-3.5.0-34-generic but it is not installed E: Unmet dependencies. Try using -f. sudo apt-get upgrade -f: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following NEW packages will be installed: linux-image-3.5.0-34-generic 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. 3 not fully installed or removed. Need to get 0 B/11.8 MB of archives. After this operation, 25.9 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 191530 files and directories currently installed.) Unpacking linux-image-3.5.0-34-generic (from .../linux-image-3.5.0-34-generic_3.5.0-34.55_i386.deb) ... This kernel does not support a non-PAE CPU. dpkg: error processing /var/cache/apt/archives/linux-image-3.5.0-34-generic_3.5.0-34.55_i386.deb (--unpack): subprocess new pre-installation script returned error exit status 1 No apport report written because MaxReports is reached already Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.5.0-34-generic /boot/vmlinuz-3.5.0-34-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.5.0-34-generic /boot/vmlinuz-3.5.0-34-generic Errors were encountered while processing: /var/cache/apt/archives/linux-image-3.5.0-34-generic_3.5.0-34.55_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) wil@wil-ThinkPad-T42:~/Desktop$

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• Just installed Ubuntu 12.04 - integrated speakers aren't working but headphones are

  - by Mat Elkan

  I've just installed Ubuntu 12.04 alongside Windows Vista. There were no previous versions of Ubuntu installed. My computer is a Sony Vaio all in one, with integrated sound card and speakers. I can't get any sound coming from the speakers, but if I plug headphones into the jack on the side of the computer and select "headphones" under "sound" in "system settings" I can get sound through them. I have been searching all day trying to find a fix but haven't had any luck. Any advice would be greatly appreciated. Thanks! Mat :-)

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• Issues with Dz77BH-55K Motherboard and i7 processor on 12.04

  - by Naveed

  I just built a computer with Intel's DZ77BH-55K motherboard with i7-3770 processor. On 12.04, 11.10, and 11.04 and Linux Mint 12, the computer has been really laggy. The graphics aren't working (choppy effects, bad resolution) and the keyboard and mouse inputs are even laggy and unreliable (skips keystrokes). I'm not sure what the problem is or what I can do to fix it. I tried sudo apt-get install mesa-utils but nothing changed. I've also messed around in the BIOS but no luck there either. Any ideas? Could it possibly be a hardware issue?

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• How to fix Xubuntu LightDM Theme after installing unity.

  - by Christopher

  After successfully installing Xubuntu 12.04.1 on my laptop, I decided to install Unity. That went OK but then I realized there was no themes. So then I installed the themes and artwork, and got a really bad surprise. My lightDM greeter was still Xubuntu like I wanted but the buttons where you choose the user are really tall and I have a purple computer as the icon above my computer name. How do I get back to the original Xubuntu configuration or edit the CSS while keeping Unity? I know where all of the files are but don't know which file to edit or which CSS property to modify. Packages Installed: unity unity-services unity-mail Then I Installed: ubuntu-artwork light-themes ubuntu-wallpapers-oneric ubuntu-wallpapers-precise

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• Toshiba satellite L500 no Wifi anymore!

  - by Benjamin Piller

  I have a Toshiba Satellite L500 with Ubuntu 12.04 and its wifi suddenly stopped working!! I've never seen like that before.. I tried also using external USB wifis but no success. I am not able to turn it on with the function keys nor using rfkill commands and similar WLAN manipulator Commands in the terminal! It was working before for at least 4-5 months!! The computer says it's turned off by hardware. I checked it and the Driver is fine. So why can i not use any Wifi on my computer?? Why it is suddenly disabled? I checked the BIOS too there is enabled the WLAN. I spent 10 hours for searching for solutions but i am out of ideas!!! Please Help!

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• How do I shutdown 12.10 when ACPI is set to OFF?

  - by rahi

  I recently installed 12.04 on an HP Spectre XT ultrabook. I installed 12.04 from a USB. When the install was complete, and the computer restarted, I got a blank screen. After some searching, I found that I had to choose "acpi=off" during the installation, which now shows up in the grub screen. Once I was on 12.04, I upgraded to 12.10. The issue now is that when I hit shutdown, the computer hangs on a purple shutdown screen. Usually, at this point, I press the power button on the machine to completely power off the machine. I am new to ubuntu, and would appreciate the help. Thanks.

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• Uncontrolled Fan and Crash

  - by RobotbeatsHuman

  I don't have sensors to properly run lm-sensors. The computer will turn on but shortly there after all the fans in it will speed way up. It stays like this for a few minutes and then the computer shuts off. Tried resetting the BIO. Went to try installing a BIOs update but it wont stay on long enough for me to try that or to do a clean install. Could this be the motherboard dying? It's mainly the CPU fan that ends up going max. after a few minutes. I checked the PSU and It's a Dell Inspiron 580. If you need more system specs just le me know.

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