In case you have notices the Linux version of Penumbra: Overture is now for sale online at
http://www.penumbra-overture.com/buy.php
.
If you run into any issues please visit the linux
Technical support forum and make sure to post what system you are running (CPU/video card) and what linux distribution (Ubuntu, Fedora, etc..) with the version and architecture (x86, x86_64). Also be sure to check the hpl.log file that is in the ~/.frictionalgames/Penumbra Overture/Episode 1 directory and attach it/post it to your thread post on the tech support forum.
Also be sure to read the FAQ at the top of the Tech support forum.
Anyways, Enjoy playing Penumbra: Overture in Linux.
P.S.
I AM working on the Mac Version.. There, unfortuntely is a show stopping issue that I am neck deep in trying to fix. So, please sit tight, as I will get it out as soon as it is ready.