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I am using Ubuntu 14.04.2 LTS. Sometimes Ubuntu freezes and i can't do anything anymore. What can i do to recover from this situation? In windows it was simple i just had to use task manager via alt+ctrl+delete. Is there something like this in Ubuntu? I know that there is xkill and System Monitor in Ubuntu but when Ubuntu freezes i can't use any of them and i can't open terminal and even though i have set a shortcut for xkill but still after freezing happens i can't use xkill. It's like after freezing nothing works.

Gandalf
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  • @karel Is there a way not to reboot the system? – Gandalf Aug 03 '15 at 07:08
  • Ctrl+Alt+Backspace keyboard combination to kill X server: 1. From terminal type: sudo dpkg-reconfigure keyboard-configuration 2. Press Enter key 5 times to skip all keyboard related options except for the terminate X server part. 3. Select Yes at the X server screen and press Enter. Wait a bit while everything configures and close the terminal. – karel Aug 03 '15 at 07:18

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Press Alt+PrtSc and while holding on these two keys type REISUB. for more information you can found you answer here.

Community
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    So you mean nothing else can be done but rebooting? – Gandalf Aug 07 '15 at 08:44
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    R: Switch to XLATE mode E: Send Terminate signal to all processes except for init I: Send Kill signal to all processes except for init S: Sync all mounted file-systems U: Remount file-systems as read-only B: Reboot –  Aug 07 '15 at 08:57