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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