i cant launch the actual game, just view skins and snapshots

im really new to this but i got linux on my computer, got the game, all of that but now when i run launcher, i can only really view snapshots, skins, and all of that. however, i cant run the actual game itself. it keeps saying theres a bug and sending me to this site. ive tried alot of things but im not sure what to do anymore. any help is appreciated