Nepeta Leijon
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Seems really weird for Mojang to force every Linux user to update to 20+ when 19.3 is still supported and usable - especially in such a snap update too.
I hope they figure something out to allow older Linux users to still play instead of forcing everyone up possibly multiple versions; it seems really dumb to just be like "19 and below isn't supported anymore but we won't tell you that explicitly."
I noticed a similar issue like this too while trying to resolve the GLIBC issues. It seems like Linux has access to a later version of the launcher than is available on Minecraft.net, and it actually runs instead of failing, but is totally unable to authenticate that you're you.
Downloaded the launcher from Minecraft.net, same 'LoadErrorNotPresent' issue (which I believe is just a less detailed version of this one) and also deleted the .version to try to force an update, same issue.
Seems like either the newest version of the launcher isn't officially out yet or the issue is still present.