Ubuntu 20.04 Text splitting and screen flickering

Solution 1:

I had the exact same condition and I was able to fix it by removing the 3rd party AMD Radeon drivers I had previously installed (and had been working fine up until this morning when I did a SW package upgrade & rebooted). I ran the following commands and rebooted. Now my display is back to normal:

sudo apt install ppa-purge
sudo ppa-purge ppa:oibaf/graphics-drivers