my recommendations after a vigorous online search to fix linux mouse issue
run the game on windowed mode on a resolution no higher that 1024 by 760 or 1280 by 720
try that and if for any reason it does not works, checkout this post about an indie bundle
Why is this only happening on this game (as far as I'm aware), when other Unity games on linux seem to work ok?
What are we supposed to look at in the forum post?
Hi, how do we start the game on windowed mode? Or how do we change resolution? I cannot find any readme with configuration or options.
I'm afraid that forum link does not help much, it's for a problem with ubuntu's unity interface but it's an Unreal engine 3 game.
That link is to Dungeon Defenders error...which doesn't run Unity..it runs Unreal Engine 3.
try asking for assistance on unity forums? thats to the Dev, not the players ;)