I was trying to install amdpro divers, so followed the instructions and after installing the driver run this command:
sudo usermod -a -G video $LOGNAME
After that, I'm locked out of the PC.
To resolve this, I entered as root in recovery mode and run
mount -o rw,remount /
as suggested here but I get this error:
mount: special device remount does not exist [Time ] Timed out waiting for devide dev-di... [Depend] Dependency failed for /devdisk/by-... [Depend] Dependency failed for Swap
So have left clueless and appreciate your help.