I came across this situation where pressing Ctrl+Alt+F11 brings up a blank screen with a flashing cursor.
I can't see where to disable that key combination. Any help? From the link above it seems to be a Gnome thing.
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1This doesn't answer your question, but to go back to your graphical session, keep pressing Alt+left for a while. – Jorge Suárez de Lis May 01 '13 at 09:44
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CTRL+ALT+F1 helped on my Ubuntu 22.04. I was astonished that this happened to me, I was trying to set a keymap in IDEA. – franc Oct 23 '23 at 11:19
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This requires some manual X11 server configuration. Look in /etc/X11/xorg.conf; if it doesn't exist, you'll need to create it (type Ctrl+Alt+T to open a Terminal and run sudo -H gedit /etc/X11/xorg.conf on it) with the following contents:
Section "ServerFlags"
Option "DontVTSwitch" "on"
EndSection
If it does exist, look for a Section "ServerFlags" and add the Option line above to it; if there isn't one, append the above lines to the file.
Radu Rădeanu
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1Source: http://superuser.com/questions/302460/how-to-disable-ctrl-alt-function-key-combinations-on-debian – duxk.gh May 17 '13 at 12:31