I have latest ubuntu release (20.04) with gnome fallback session. After reboot I got all letters scrambled. On desktop, in terminal, in explorer all files have only first four letters. I don't know how to describe it better. In firefox it's alright, menus have all letters.
Update: I tried solution from that page: https://forums.linuxmint.com/viewtopic.php?p=1996836
I did: sudo ppa-purge -d focal ppa:oibaf/graphics-drivers
Result: I can not get to Ubuntu any more...it's stuck on boot, just like in my previous thread: Ubuntu 20.04 stuck on boot
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while it's highlighted) before pressing Enter on it (and adding thenomodeset
param (before the part that says "quiet splash"))). All the while you are doing this, keep an eye at the text at the bottom of the Grub screen: it contains instructions. Or, alternatively, one could also use the "recovery mode", and its "drop to root shell" feature: https://wiki.ubuntu.com/RecoveryMode – Levente Apr 04 '21 at 18:13