Snap can be disabled in Ubuntu 20.04 LTS. See the following blog post: https://www.kevin-custer.com/blog/disabling-snaps-in-ubuntu-... (discovered this before seeing relevant comment by @guiambros on the 2nd page :-). Relevant HN discussion at the time can be found here: https://news.ycombinator.com/item?id=22972661.