Ubuntu – Alt+Left Arrow turns screen black


I have Ubuntu Gnome 16.04 installed and every time I press Alt+Left Arrow to go up a directory in my file browser or back a page in my web browser my screen turns all black and there is a terminal cell. Once I press it Alt+Left Arrow again I go to the login screen. Why is this happening and how do I fix this? Any help would be appreciated.

Update: I added an additional tag because it is known to happen in 18.04 too.

Best Answer

There is an open issue about this:


A solution that worked for me was to run:

sudo kbd_mode -s

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