Some users have reported that they cannot boot AriOS properl.
If you encounter such a problem and see a gray screen instead of GNOME, simply switch to a virtual console by pressing Alt+Ctrl+F1. If you are booting inside Virtualbox, use HOST key (usually right ctrl) +F1.
sudo killall Xorg
sudo stop lightdm
sudo start lightdm
This should get you into GNOME.