How can I restart X Window Server from the command line?
I'd really like to be able to restart my GUI without having to do a full system reboot.
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NOTE: This will forcefully quit all graphical programs, you'll lose any unsaved work, and you'll be logged out. Non-graphical programs will not be affected.
TL;DR: on systems with systemd (Ubuntu 15.04 and newer)
sudo systemctl restart display-manager
This will restart the appropriate display manager service (
lightdm till 17.04,
sddm in Kubuntu, etc.). You can replace
sddm, etc. if needed, but this should be enough.
For other Ubuntu versions, first find which display manager your ubuntu is having with following command:
Than depending on what display manager, you can use one of the following commands:
Default Ubuntu (with LightDM)
sudo systemctl restart lightdm
Gnome (with GDM)
sudo systemctl restart gdm
KDE (with KDM)
sudo systemctl restart kdm
Note: From 12.10 to 15.04, Kubuntu also uses LightDM.
For MDM (e.g. for Mint Cinnamon)
sudo systemctl restart mdm
Since ubuntu 9.04 Ctrl+Alt+Backspace is disabled, however you can now type Alt gr + Print Screen + K.