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How to Stop, Restart X window in Ubuntu 12.04

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linux-howto

http://ubuntuguide.net – This simple tutorial shows how to stop or restart X server in Ubuntu using command or keyboard shortcuts. Normally, X-windows need to restart when having problems with dual monitor or video card driver. Since Ubuntu 10.04, we can use following key combination to restart X: right Alt + PrtScr/SysReq + K For command line: Restart Ubuntu’s default LightDM display manager, use: sudo service lightdm restart Restart gnome display manager GDM, use: sudo service gdm restart Restart KDE display manager KDM, use: sudo service kdm restart You can change parameter restart to stop/start to stop/start (HowTos)