How to fix the gray screen bug in VirtualBox

If you see a gray screen instead of GNOME when entering the system, simply switch to a virtual console by pressing Alt+Ctrl+F1. If you are booting inside Virtualbox, use HOST key (usually right ctrl) +F1.

Then run:

sudo killall Xorg

sudo stop lightdm

sudo start lightdm

This should get you into GNOME.

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