Steam crashes after launching a game

Hello, i have a weird bug when Steam crashes a few seconds after i launch a game (and the game crashes too), and i don't know how to fix it.

Infos :
OS Version : 17.2 Core
Steam install : installed from the "Steam installer app" on Software (the one recommended in the Zorin docs)
The "Steam installer app" was installed from a different account than the one where crashes occured (idk if the crashes appen on the main account, I'l try later)