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• How to copy the file from source to destination only once at a time?

  - by Viswa

  I have to copy the file from my desktop to my mounted directory. I was using the following command to copy the file from my desktop to mounted directory. os.system("cp -f /home/Desktop/filename /media/folder_1"). It works fine. But the problem is while copying the file from my source to mounted directory(folder_1) if any interruption is happens like network down, then the system continuously keep on trying. It couldn't skip that process. Finally, when the network comes the files are again copy to my mounted directory. Due to this continuous trying, next time i try to move the content it throws "permission denied" error. How do i copy the file only once, if any network issues happen then it will not keep try to copy, instead of that, it throws the error. If you know, Let me. Its very useful to me.

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• gnome shell with very high CPU usage

  - by 501 - not implemented

  i'm running ubuntu gnome 13.10 on my dell latiude e6510 with a i5 m560. The I5 comes with a embedded Intel HD 3400 Graphics. The average cpu usage of the gnome-shell is by 160% it's to high, I think. Is there a problem with a driver? If i call the command glxinfo | grep OpenGL it returns: OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.3, 128 bits) OpenGL version string: 2.1 Mesa 9.2.1 OpenGL shading language version string: 1.30 OpenGL extensions: Greetings

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• Ubuntu 13.10 vs 12.04 LTS

  - by Shaun

  I am migrating my workflow to ubuntu from windows. I have a macbook pro at home and I really enjoy being able to use the workspaces feature on ubuntu to increase my productivity. As myself being someone that isn't very familiar with doing command line things and hasn't worked with linux a whole lot other than doing basic commands like cd, ls, rm, screen, and sudo. I was wondering what you think would be the best choice for a ubuntu version. I am looking for ease of use as well as stability. I spend most of my time working with eclipse, as well as writing documents. On a side note, right now I have a pretty high end workstation, but I am using a crappy notebook 2.5 inch 1TB hard drive for my system. Would it be worth it to switch to a top of the line SSD, or would the difference not really be noticeable? How difficult would it be for a newcommer to setup the system with the os and important folders running on a SSD and then other folders for storage running on a HD.

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• How to xkill an application by its id?

  - by Hanynowsky

  I need to simulate the behavior of the keyboard shortcut (ALT+F4) using Terminal for a given application. If I open for example gedit and click ALT + F4 , then GEDIT will be xkilled. If I want to achieve same thing using Terminal, how should I proceed? The command export PIDTOKILL=pidof gedit | grep [^*]; xkill -id $PIDTOKILL does not work and gives the following error: xkill: killing creator of resource 0x3f38 X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 113 (X_KillClient) Value in failed request: 0x3f38 Serial number of failed request: 8 Current serial number in output stream: 9 I think I am confusing application id and process id here

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• Hangs on Splash Screen after login (auto-login), how can I fix this?

  - by Davious

  Computer: Toshiba Terca A4 OS: Ubuntu Desktop 10.10 After installing 10.10, the splash screen hangs and the mouse pointer appears. Anyone know what I can do to fix this? ~/.xsession-errors has (nautilus:3190): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed btw, Safe-mode works: I do a Ctrl-Alt-F1 into a command prompt session and run ps aux | grep slave then sudo kill [id of gdm-simple-slave] That killed the session and allowed me to login in safe-mode. Safe-mode works. Then I open a terminal and run ps aux | grep nm- sudo kill -9 [id of nm-applet] nm-applet --sm-disable & to get my internet connection up.

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• /dev/sda1 100% Mysql to blame?

  - by SJP

  I have a an API running that receives raw binaries, processes them, and then stores metadata about the bins in a mysql database. I have been running it for a couple days on a VM. Today the API stopped processing the mySQL commands. After using the command df-h the results were: root@mwdb1:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 104G 99G 0 100% / udev 16G 4.0K 16G 1% /dev tmpfs 6.3G 364K 6.3G 1% /run none 5.0M 0 5.0M 0% /run/lock none 16G 0 16G 0% /run/shm /dev/sdb1 5.5T 42G 5.2T 1% /data sda1 is at 100%

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• Programming Interview : How to debug a program?

  - by Jake

  I was recently asked the following question in an interview : How do you debug a C++ program ? I started by explaining that programs may have syntax and semantic errors. Compiler reports the syntax errors which can be corrected. For semantic errors, various debuggers are available. I specifically talked about gdb, which is command line, and Visual Studio IDE's debugger, which has a GUI, and common commands. I also talked about debug and release version of code, how assertions should be used for debug build, how exceptions helps in automatic cleanup & putting the program in valid state, and how logging can be useful (e.g. using std::clog). I want to know if this answer is complete or not. Also, I want to hear how other people will go about answering this question in a structured manner ? Thanks.

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• Ubuntu 12.04 LTS Purple Screen Error. FIX

  - by user100918

  When I boot up my Ubuntu, it hangs on the purple screen. All I can do is press Shift on start up and it gives me these 3 options. -Normal Boot -Perform Disk Scan -Restore Factory Settings I can also either press E or C. C for for GRUB command line. E for GNU GRUB and says these things setparams 'Restore Factory Settings' set gfxpayload=text insmod part_msdos insmod ext2 set root='(hd0,nsdos1)' linux /boot/vmlinuz-3.3.8-24-generic root=LABEL=SYSTEM ro acpi_osi_=Linux acpi_backlight=\ vendor quiet aufs=restore initrd /boot/initrd.img=3.3.8-24-aufs What is the problem and how do

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• KeyTouch remaps the delete key

  - by Robert Gowland

  I installed KeyTouch, but it decided that the delete key should be the KeyTouch hot key. So, when I pressed deleted, KeyTouch came up. Next I uninstalled KeyTouch and now the delete key doesn't do anything. Is there any way to remap the delete key to actually delete? Notes: I tried reinstalling KeyTouch, and the same thing happens. KeyTouch does not allow the user to map the delete key. EDIT xev shows keycode 119 when I press the delete key xmodmap shows keycode 119 mapped to Delete NoSymbol Delete running xmodmap -e "keycode 119 = Delete" from the command line does not resolve the issue

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• How do I install VirtualBox 4.1?

  - by William

  How to install virtualbox-4.1.4 in ubuntu 11.04 fluently? when apt-get install libqt* unmet dependency. there is a long list of unmet dependency. Where start first and any command to install virtualbox fluently? You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: virtualbox-4.1 : Depends: libcurl3 (>= 7.16.2-1) but it is not going to be installed Depends: libqt4-network (>= 4:4.5.3) but it is not going to be installed Depends: libqt4-opengl (>= 4:4.7.0~rc1) but it is not going to be installed Depends: libqtcore4 (>= 4:4.7.0~beta1) but it is not going to be installed Depends: libqtgui4 (>= 4:4.7.0~beta1) but it is not going to be installed Recommends: libsdl-ttf2.0-0 but it is not going to be installed Recommends: dkms but it is not going to be installed Recommends: libhal1 (>= 0.5) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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• Why is "sudo virsh" hanging in the console?

  - by technophobia

  I wanted to experiment with OpenStack on my iMac: So I installed Ubuntu Cloud Live Image on a VM and I also ran DevStack on a fresh Ubuntu 64-bit Server VM. The DevStack script hangs on the following line: instances=`sudo virsh list --all | grep $INSTANCE_NAME_PREFIX | sed "s/.*\($INSTANCE_NAME_PREFIX[0-9a-fA-F]*\).*/\1/g"` I commented that block and ran the script again, this time it did not hang; thus completing its run. I attempted to run sudo virsh list --all on my CloudLive VM and it just hands until I break out of it. Why is sudo virsh hanging? Your help is appreciated. Note 1: The virsh command responds without sudo. Note 2: Not sure it matters, but I'm running my Virtual Machines in VMWare Fusion.

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• Not your typical Permission Denied Question

  - by Todd

  I recently reinstalled Ubuntu 11.10 (64 Bit) on my computer. (My hard drive took a powder) Before, I could "mv" files around with the command. Now when I try I get the permission denied message. I also get the message about "man sudo" when I open my terminal. I am pretty sure I did not get that before. Can I add a user/administrator and change something in my orginal admin that I cannot change myself? I am getting really frustrated with this. I do not recall having the same problem before. I tried qksudo nautilus and it appears to run then it sits there with the cursor blinking but does not move.

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• Need to run `nvidia-xconfig` before booting

  - by RobinJ

  I formatted my whole hard drive, and installed Elementary OS (Ubuntu 10.10) on it in an attempt to get rid of all the problems. It failed. Every since I installed the nvidia-current drivers I first need to boot into recovery mode, and run sudo nvidia-xconfig before booting the system in the normal way. If I don't do this, it will just stop at a black screen after the boot screen, responding to nothing but CTRL+ALT+DELETE and the power button. When I boot the system after running the nvidia-xconfig command I can just start working as usual. Update I suspect it's got something to do with Plymouth. I shall have to try it again before I can confirm it, but removing the quiet and splash parameters from the kernel line in /boot/grub/grub.cfg seems to help. But still, I like my Plymouth screen. A black screen with text rolling over it (or without the text) doesn't attract me much.

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• Interface design where functions need to be called in a specific sequence

  - by Vorac

  The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at different times and places. For example, module A and module B can both request (at different times) some resources from my module. Those 'resources' are actually what the configuration is. 2) After it is clear that no more requests are going to be realized, a startup command, giving a summary of the requested resources, needs to be sent to the hardware. 3) Only after that, can (and must) detailed configuration of said resources be done. 4) Also, only after 2), can (and must) routing of selected resources to the declared callers be done. A common cause for bugs, even for me, who wrote the thing, is mistaking this order. What naming conventions, designs or mechanisms can I employ to make the interface usable by someone who sees the code for the first time?

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• vmbuilder fails on chroot

  - by Bruce

  I am trying to install virtual machine with this command, but have no success: vmbuilder kvm ubuntu --verbose --suite precise --flavour virtual \ --part partitions.txt --ip 192.168.1.3 --hostname edb1 --arch amd64 \ -o --libvirt qemu:///system --user someuser --pass somepass \ --raw /home/virtual-machines/edb1.disk1.img \ --raw /home/virtual-machines/edb1.disk2.img \ --domain somedomain.com --mem 4096 --cpus 4 This is the error: ... I: Extracting xz-utils... I: Extracting zlib1g... W: Failure trying to run: chroot /tmp/tmp_JdKzu mount -t proc proc /proc , stderr: The host kernel is not original but modified by server provider. Why is the chroot needed for installation?

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• Is it possible to update my graphic card drivers?

  - by madmaxpt

  This is what the lspci -v command shows in the VGA compatible controller section: 00:02.0 VGA compatible controller: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller (prog-if 00 [VGA controller]) Subsystem: Dell Device 048e Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at f0200000 (32-bit, non-prefetchable) [size=512K] I/O ports at 18d0 [size=8] Memory at d0000000 (32-bit, prefetchable) [size=256M] Memory at f0000000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 i915 is only compatible with OpenGL 1.4 and cannot use shaders and I'd like to use some Open GL 2.0 functionalities. Is it possible to update the drivers or is my hardware limited to OpenGL 1.4 ?

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• dbus error on 14.04 after system is left idle for a few hours

  - by user281513

  I did a clean install of 14.04 on a crucial M4 64gb ssd. The system boots in less than 30 seconds now! but.. when I leave it idle for a few hours and log back in nothing works .. if I do a simple command like df ..I get a dbus error message. I also have a toshiba sata disk mounted for general storage since the ssd is so small .. nothing appears to be damaged when I reboot but it is extremely annoying .. any ideas on how to correct this will be appreciated.

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• Run a script with user interaction on log out / shutdown?

  - by lumbric

  I'd like to run a script on shut down, which interrupts the logout process and and pops up a window with zenity. My target is to get autofsck working with lightdm. It seems to work with 12.04 after installing the old *.deb file, if one runs the check script manually. In order to use it, it should run automatically on log out and ask the user if she/he wants to check the disc on shutdown. There is the option session-cleanup-script in the file /etc/lightdm/lightdm.conf which seems to work, if a bash file with full path is used (I can't place the command directly there). But if I press shutdown, there is no time for a user choice. Is there any other option to solve this problem?

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• Can't control connection bit rate using iwconfig with Atheros TL-WN821N (AR7010)

  - by Paul H

  I'm trying to reduce the connection bit rate on my Atheros TP-Link TL-WN821N v3 usb wifi adapter due to frequent instability issues (reported connection speed goes down to 1Mb/s and I have to physically reconnect the adapter to regain a connection). I know this is a common problem with this device, and I have tried everything I can think of to fix it, including using drivers from linux-backports; compiling and installing a custom firmware (following instructions on https://wiki.debian.org/ath9k_htc#fw-free) and (as a last resort) using ndiswrapper. When using ndiswrapper, the wifi adapter is stable and operates in g mode at 54Mb/s (whilst when using the default ath9k_htc module, the adapter connects in n mode and the bit rate fluctuates constantly). Unfortunately, with this setup I have to run my processor using only one core, since using SMP with ndiswrapper causes a kernel oops on my system. So I want to lock my bit rate to 54Mb/s (or less, if need be) for connection stability, using the ath9k_htc module. I've tried 'sudo iwconfig wlan0 rate 54M'; the command runs with no error but when I check the bit rate with 'sudo iwlist wlan0 bitrate' the command returns: wlan0 unknown bit-rate information. Current Bit Rate:78 Mb/s Any ideas? Here's some info (hopefully relevant) on my setup: Xubuntu (12.04.3) 64bit (kernel 3.2.0-55.85-generic) using Network Manager. My Router is from Virgin Media, the VMDG480. lshw -C network : *-network description: Wireless interface physical id: 1 bus info: usb@1:4 logical name: wlan0 serial: 74:ea:3a:8f:16:b6 capabilities: ethernet physical wireless configuration: broadcast=yes driver=ath9k_htc driverversion=3.2.0-55 firmware=1.3 ip=192.168.0.9 link=yes multicast=yes wireless=IEEE 802.11bgn lsusb -v: Bus 001 Device 003: ID 0cf3:7015 Atheros Communications, Inc. TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287] Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 255 Vendor Specific Class bDeviceSubClass 255 Vendor Specific Subclass bDeviceProtocol 255 Vendor Specific Protocol bMaxPacketSize0 64 idVendor 0x0cf3 Atheros Communications, Inc. idProduct 0x7015 TP-Link TL-WN821N v3 802.11n [Atheros AR7010+AR9287] bcdDevice 2.02 iManufacturer 16 ATHEROS iProduct 32 UB95 iSerial 48 12345 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 60 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 6 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x04 EP 4 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x05 EP 5 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 255 Vendor Specific Class bDeviceSubClass 255 Vendor Specific Subclass bDeviceProtocol 255 Vendor Specific Protocol bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered) iwlist wlan0 scanning: wlan0 Scan completed : Cell 01 - Address: C4:3D:C7:3A:1F:5D Channel:1 Frequency:2.412 GHz (Channel 1) Quality=37/70 Signal level=-73 dBm Encryption key:on ESSID:"my essid" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Master Extra:tsf=00000070cca77186 Extra: Last beacon: 5588ms ago IE: Unknown: 0007756E69636F726E IE: Unknown: 010882848B962430486C IE: Unknown: 030101 IE: Unknown: 2A0100 IE: Unknown: 2F0100 IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: Unknown: 32040C121860 IE: Unknown: 2D1AFC181BFFFF000000000000000000000000000000000000000000 IE: Unknown: 3D1601080400000000000000000000000000000000000000 IE: Unknown: DD7E0050F204104A0001101044000102103B00010310470010F99C335D7BAC57FB00137DFA79600220102100074E657467656172102300074E6574676561721024000631323334353610420007303030303030311054000800060050F20400011011000743473331303144100800022008103C0001011049000600372A000120 IE: Unknown: DD090010180203F02C0000 IE: WPA Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 iwconfig: lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"my essid" Mode:Managed Frequency:2.412 GHz Access Point: C4:3D:C7:3A:1F:5D Bit Rate=78 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=36/70 Signal level=-74 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0,

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• Update GRUB to reflect changed partition location

  - by soandos

  I currently have 3 partitions: Windows, Ubuntu, and swap. I want to move my windows partition by about 20GB. When I try to do this in GParted, it tells me that this will mess up GRUB, and that there is a page that can resolve these issues. However, this page does not actually mention my issue. I am not moving my boot partition (Ubuntu). How can I force GRUB to look for operating systems that are on the drive? I know that this is possible, because when Ubuntu was installed it found Windows without any issues. Additionally, if I create a copy of a partition, how can I add that to GRUB (I assume it will be the same command as above, but if not, what would it be)? Note: OS prober is mentioned here but it doest not list how to use it, or where to find it.

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• could not save the file /usr/... permission denied (13.04)

  - by plaguedoctor

  I am running Ubuntu 13.04 and am trying to create an .sh file for conky in /usr/bin using gedit. When trying to save I get the error dialogue: Could not save the file /usr/bin/conky-start.sh You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again." From searching, I think I have to run a command in terminal to allow permission, but I couldn't find out what that is. Edit: I'm trying to create the file conky-start.sh, not change or run it. Thus far, I've opened gedit, copied and pasted some required info from the net, and I'm trying to save-as /usr/bin/conky-start.sh Perhaps I need to create the file first in terminal, then edit it? How would I do that?

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• Graphics corrupt after upgrade from 11.10 to 12.04

  - by RiaanZA

  I'm stuck at the moment with an ubuntu that boots into an unusable white screen after upgrading from 11.10 to 12.04. I've tried booting into safe X mode but it just throws me back to the safe menu every time. Restore previous graphics driver, use default graphics configuration and set up new graphics configuration all don't work either. I've tried various methods of resetting the graphics from the command line, but none are working due to unmet dependencies. These cannot be fixed by doing the normal "apt-get -f install" because its saying there is a dpkg error in var/lib/dpkg/status (blank line relating to skype-wrapper). I haven't been able to find any other way to fix the dependencies yet. Can someone please give me some advice on what to do, I really don't want to go the re install route.

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• I have to add Weather extension in my gnome3 toolbar

  - by Housslv

  I want to add a weather extension to my gnome3 toolbar but I cant get anything working. I am using ubuntu 12.10 with gnome3. I tryed to add this sudo add-apt-repository ppa:webupd8team/gnome3 sudo apt-get update sudo apt-get install gnome-shell-extensions-weather but the last command doest work it says that it cant locate such file. I installed this https://launchpad.net/weather-indicator. But I cant seem to get it to show on the gnome toolbar. It only shows here http://img32.imageshack.us/img32/4108/weatherhl.png. Thanks for help!

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• WSS Fails Installing On Step 5 Of The SharePoint Products and Technologies Configuration Wizard

  - by ptahiliani

  I've attempted to install WSS 3.0 with SP1 several times as both stand-alone and server farm with no luck on Windows Server 2008.  When I get to step 5 of Configuration wizard it begin installing and publishing services but on Step 5 I get the message "Failed To Register Sharepoint Services". The detail behind this message reads "An exception of type Microsoft.SharePoint.SPException was thrown". Then I Run the command psconfig -cmd configdb -create -database <whatever_unique_name> Click on Start / All Programs / Administrative Tools / SharePoint Products and Technologies Configuration Wizard Should work now (it did with me). PS: This was done on a Virtual Machine (VMware)

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• YELP does not work right

  - by DWolfman

  When I click on DashHome then click on the questionmark, It brings up the help system. However when I enter a command to search on it tells me this does not exist. From what I understand the engine is YELP and is suppose to search everything including the man pages. However, I can't get it to find anything. I tried to install the yelp package but it tells me the one that is installed is the latest version. Am I doing something wrong? Everything I read says hitting the F1 key is suppose to bring up yelp but Thanks in advance. Dave

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