App Center Screen Flashing

[tkn]

@jjschmerer

When my App Center comes the App Center screen vigorously flashes and its hard to use it. How can I fix this?

It is a known issue, see this thread, a lot of info there:

App Center Glitching

I just got back to Ubuntu Mate after a brief stint of distrohopping the past few months or so. Decided I'm finally gonna settle down, hopefully. I'd usually remove Snaps, but I decided to give them another shot this time. Everything's fine and all so far, and I'm liking it. However, my App Center seems to be graphically glitching, kind of like flickering. Figured it might be outdated so I updated it through the terminal and all, still same same. Everything works though, just that. I usually wo…

The solution (thanks to @keiaa.07.05.00 ):

First, test if the app works glitch free if you type this from a terminal:

env LIBGL_ALWAYS_SOFTWARE=1 /snap/bin/snap-store

If it works, you can modify the faulty menu entry in the following way:
Use the menu editor (either mozo or libremenu) to edit the App Center entry and change this line:

/snap/bin/snap-store %U

into:

env LIBGL_ALWAYS_SOFTWARE=1 /snap/bin/snap-store %U

Save the changes and everything should work now.

Don't forget that the snap-store can only install a bunch of snaps but it will not show nor install any of the 90,000+ native conventional debian-based software packages that the rest of humanity enjoys from the standard repositories.
You probably want synaptic for that