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It happens to me from time to time on Ubuntu 20.04. The screen freeze and nothing seems to work. keyboard combinations like Alt-F2 , Ctrl+Alt+F4 are not responding. logging via ssh from another machine works fine and using htop I do not see any process that is high in RAM and/or CPU usage.

What should I do to restart the display manager (gnome) without rebooting?

Alexis Wilke
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hans
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    sudo systemctl restart gdm.service if you are using systemd. – starkus Jun 09 '21 at 04:24
  • I tried @starkus suggestion. I was logged out and all applications were closed. I do not know if this should happen. Is there a way of refreshing the display with out logging out. Thank you – hans Jun 09 '21 at 08:23
  • ALT+F2 and r, but that's not what you are looking for I guess. – starkus Jun 09 '21 at 22:07
  • You may be interested by these answers: https://askubuntu.com/questions/100226/how-to-restart-gnome-shell-from-command-line – Alexis Wilke Jul 08 '23 at 15:53

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