If someone ever had problems with minimizing ET on linux, here is how to do this: open console in game by pressing "~" press ALT+ENTER combination now you should have the window in windowed (not fullscreen) mode, the window manager decoration should be visible, you should be able to move the mouse cursor outside the game window (it doesn't posses it anymore) press the window minimize button That's it. The key in these steps is the first one, the opened console. Without this, even after ALT+ENTER is pressed, you won't be able to move the mouse outside of the game window to minimize it.