Dup of #35215 . Apparently problem is due to old AMD architecture. There was mention of 1.3.1 working on the older CPUs. So no big deal because it's not a problem on my new Ryzen build. I mentioned Cinnamon working and Mate not working, which was a suspicion but it wasn't that. I think this is the first time I've had an older CPU cause a problem in a single program, especially when both (working and not) OS's both run the same 64bit kernel 5.4.0-42-generic.