Personnally, to install the SteamOS session, I use this command:

sudo add-apt-repository ppa:thor27-gmail/steam-desktop && sudo apt-get update --quiet && sudo apt-get install steam-login --quiet

Found on the french Ubuntu support site:
http://doc.ubuntu-fr.org/steam

Check for #4.

It takes care of everything, even the updates.

EDIT: ATM, to use this command, you need to change the source to Saucy. The Thrusty repo has not been created yet but the developper supporting it told me he would try hard to do so in the next few days.

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At least, what is positive, it's the frequency of the game updates. It's the 3 one in about 2 weeks. We can hope for a playable game for all in a near future.

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i7-2600
16gb DDR3-1333Mhz
GTX-750 Ti with NVidia Driver version 340.24
Ubuntu 14.04 with Steam Desktop from Thor 27 repository (Adds a SteamOS icon in your login session selector)

I run the game at Ultra settings and it runs flawlessly. No lag, no crash except when I exit the game.

Have you tried lowering the texture cache size? In my case, it gave me a good performance boost before the last 2 upates. Not mentionning solving many game chrashes.

The other thing I found on The Witcher 2 Github is the fact that too many saved games makes it unstable.

Happy W2!

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Linux 3.10... My memory could fool me, but it's the Debian Kernel, isn't it?
Could'nt it be SteamOS?

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