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Have attempted fix using fonts in tweaks but that also only displays 4 characters for any font name and does not fix problem. Have tried installing alternative desktop and running several different terminals with no change.

Martyn
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    There are a tons of this reported, search for "4 letters" or something, sorted by newest. It seems to be related to either oibaf/graphics-drivers PPA or some MESA graphics drivers. Maybe they are one and the same thing... Some people talked about puriging, some about downgrading. I have not seen a complete answer yet that would demonstrate the specific commands needed for a fix. – Levente Apr 05 '21 at 19:29

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Really the problem is with oibaf/graphics-drivers, after remove and reinstalled gnome-shell it returned to normal.

sudo apt install ppa-purge;sudo ppa-purge ppa:kisak/kisak-mesa -y

sudo ppa-purge ppa:oibaf/graphics-drivers -y

This will remove all oibaf drivers, then reinstall gnome-shell

sudo apt install gnome-shell -y

João Mello
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