When I tried to start minecraft java edition to play it, I got a pop up saying it was updating. I usually manually update, (download "other" minecraft launcher, use Ark to unpack it into a minecraft-launcher folder). After waiting a few minutes I checked with TOP in Kconsole and it showed several minecraft-launc processes running. I could not stop them as they kept respawning. I had to delete the minecraft-launcher folder from my computer and then delete the .minecraft folder from my home directory to get the spawning to stop. Redownloading the launcher and extracting it results in a minecraft-launcher folder with just a minecraft-launcher executable which does the same thing.  I saved the original .minecraft folder as minecraft_old in hopes my saved progress is not lost for good, though that is not vital. I would just like to be able to start the game. 

I was on 21w08b before this all happened and I am guessing it was trying to update to 21w10a but something bad happened  or the latest launcher in the Linux "other" category has some kind of issue.