My machine runs Ubuntu 22.04. I played the demo without problems, I liked the game and purchased it. The full game start time is extremely slow, in the order of minutes.

Is anybody else facing a similar issue?

Update: This does not happen if I start the game directly from the command line. I guess it is an issue with the Steam client

Update 2: Starting from the terminal allows you to play, but you will not unlock any achivements (if that is anyhow important to you)