When on default Ubuntu 16.04 LTS if you press ALT (by default) - a some kind of "command input" popup appears.
So, when you are in Factorio that global ALT key is still active and besides showing more detailed info ingame - that same command dialog appears (if not in fullscrean).
But, it you are in fullscrean, the game almost complemete freezes after pressing ALT: the image is frozen, but I still hear the in-game sounds. Also, after that freeze keyboard becomes completely irresponsive, meaning I can do nothing: neither alt-tab, nor anything else. All I can do is hard-reset my PC. The game seems to get frozen just visually, because when I was in multiplayer, I heared what was happening (e.g. my friend approached me and I heared his footsteps, he put some coal in the drill and I heard how the drill started to mine).
That really annoys cause I literally can not play in fullscrean in Ubuntu.
Factorio's log shows nothing special, just game initialization.
P.S. Maybe this is relative to this, but in my case I can freely ALT-tab when in full screen, meaning BEFORE I press ALT
P.P.S. I also know I can disable global ALT hotkey in system settings, but I still coinsider this a bug.
