Soon after I upgraded to Ubuntu 20.10, I've been experiencing these "diagonal tears" of sorts. I tried to reinstall with version 21.04, but it didn't work.
Here's what I have on my computer:
- Intel pentium
- Mesa drivers
- KDE Plasma 5 desktop
This is an example image with the highlighted text being where the effect is most visible:
Edit: I reinstalled Ubuntu 20.04, but that did not solve the issue. At this point. I'm thinking that it's an issue with drivers included with the installation or, worst-case, my graphics hardware being broken or corrupt. Hopefully, it's just the former.