[Linux] Cannot edit version of any installation

Duplicate of resolved issue MCL-12083.

It is currently impossible to change the version of any Minecraft installation within the launcher GUI - but only manually from configuration file launcher_profiles.json.

Further see: https://www.youtube.com/watch?v=ND0CAg3-bKY

I am using the generic Linux launcher ("Other") 
Tested on both the stable and beta versions.