Game window minimizing, mouse locked on Ubuntu 9.04 Jaunty

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I just bought the suite of games for Linux. Install ran smoothly and I began playing the game. A couple of minutes in, and the game window minimizes (i.e. so I can see my desktop, as if I'd clicked a 'restore window' at the top right of any normal window). I tried a couple of keyboard shortcuts to minimize the window to taskbar, restore the window size, close the window, start up a terminal, etc, but no set of keyboard inputs worked in or out of game. Also, mouse was frozen in the game window; sometimes I could move it in game and sometimes not, but I couldn't move the mouse to my desktop. I couldn't figure out a solution and had to do a hard restart. This has happened to me several times, each time a couple of minutes into gameplay. Any help would be appreciated.
-JD

Same here. After a few minutes the game switches to windowed mode, meaning the desktop task and menu bars appear and the game runs in a window. I cannot do anything. The mouse is locked and no keyboard input (Alt+Tab, Alt+F4, etc.) does anything.

You can kill Penumbra if you log into a text console (Strg+Alt+F2) and kill its process with signal 9 (15 doesn't seem to work), e.g. sudo top > k > process id > 9. After that switch back to the desktop (Strg+Alt+F7).

As this happens a few minutes into the game every time, there's no way to really play as save spots are rare and I have to do everything over and over again. All the atmosphere is gone and suspense is replaced by frustration =\