Skip to main content

What should I do when Ubuntu freezes!


All operating systems freeze some times and Ubuntu is no exception. What should I do when:

  • A program stops responding?
  • Nothing responds to mouse clicks or key presses?
  • cursor stops moving entirely?
What things can I try before hard rebooting the machine?


When a single program stops responding:

  • When a single program stops responding mostly we can close it by clicking on the X shaped close button on the top right corner of the window.We will get a dialog box saying that the program is not responding and you may press force stop or wait for the application to respond.

  • You can also kill an application using xkill. Press ALT + F2 and type xkill and press Enter.Now the mouse cursor will turn into an X. Click on the non responsive window to close it.

    When the mouse stops working:

    • If the keyboard still works, press ALT + F2 and type gnome-teminal . From there you can start to troubleshoot things. If you want to try restarting the GUI run sudo service lightDM restart .
    •  If these fail to launch, press Alt+Ctrl+F1 and login with your username and password.

    When everything, keys and mouse and all, stop working:

    • If it locks up completely, you can REISUB it, which is a safer alternative to just cold rebooting the computer.
    • REISUB by: While holding ALT and the SysR
    unRaw                   (take control of keyboard back from X),
       tErminate         (send SIGTERM to all processes, allowing them to terminate gracefully),
       kIll                       (send SIGKILL to all processes, forcing them to terminate immediately),
         Sync                  (flush data to disk),
         Unmount         (remount all filesystems read-only),
     reBoot.                (Reboot)

    REISUB is BUSIER backwards, as in "The System is busier than it should be", if you need to remember it. Or mnemonically - R eboot; E ven; I f; S ystem; U tterly; B roken.

    Popular posts from this blog


    Most of you who have a Huawei USB modem (data card) might have tried to install mobile partner (dash board) in Linux. Here I will show you how to install mobile partner in Linux. First, you have to copy the folder called Linux in the data card. The files in the data card are not accessible from Linux so copy them from Windows. Now right click the file “install” in the “Linux” folder. Go to the permissions tab and select the check box beside Allow executing as a program. Now open a terminal by pressing CTRL + ALT + Tkeys. Change the working directory to the folder “Linux” by using “cd <path to folder>”. Now type ./install. If you had installed this software in your system before, you will get a prompt: "The software is exist, do you want overwrites? ([Y]/[N])", enter "y" to overwrites or "n" to exit. If you do not had installed this software in your system before, you will get a prompt: "Please input the install path[/usr/local/Mobile_Partner]:"…

    How to setup a wifi-hotspot in Ubuntu: The terminal way.

    Ubuntu has a "Use as hotspot" mode. But it creates a n ad-hoc network only.Wireless hotspots aren't same as ad hoc networks. Significant difference is there. In short, ad hoc networks aren't supported in most Android, Windows Phone and Blackberry devices (and may be iOS devices too) whereas AP mode Wi-Fi hotspots are.

                  It is really simple and easy to setup a hotspot in Ubuntu. We use a tool called ap-hotspot. To install it open a terminal and type the following:

    sudo add-apt-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install ap-hotspot
                 Next, to start the hotspot type the following in a terminal:
    sudo ap-hotspot start
    It asks you which adapter's internet you want to share, name of the network, password, etc. in an interactive manner. To stop the hotspot type the following n the terminal :
    sudo ap-hotspot stop
    To configure it type the following in the terminal :
    sudo ap-hotspot configure

    Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?

    Some times we get the following error while trying yo install software using apt-get or synaptic packaging manager.
    E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
    E: Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?

    How can we resolve this?
    The problem occurs if we are running another applications like synaptic using the directory. So, if this is the case close the applications and try run the command again.
    You will also get this message if you forget to use  sudo  when executing an apt command. You can use sudo lsof /var/lib/dpkg/lock to find the process that owns the lock file Then try to kill the process to remove the lock.
    This should be used as last resort. If you use this carelessly you can end up with a broken system.
    You can delete the lock file with the following command:
    sudo rm /var/lib/apt/lists/lock

    You may also need to delete the lock file in the cache directory.
    sudo r…