This is probably an issue you should address with Steam or Rust's site. This site is for bug reports of Ubuntu-supported packages, and there is nothing in your Xorg log or UnitySupportTest to indicate a general xorg/graphics problem.
Before I go ahead and mark i t invalid, I suggest taking a look at output when you start the game in a terminal. ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1293204 Title: problem with loading up a steam game called 'rust' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1293204/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp