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I pressed the key combination ctrl + PrtSc on my Ubuntu with a browser window open, and it just crashed gnome. How can I get my system back without restarting the machine?

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Press Alt + F2 which brings up the "Run" dialog, enter the letter r (which stands for "restart") and then press Enter:

screenshot of the run dialog with the letter r entered

This will restart Gnome without affecting your session or restarting your machine.

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