[Ernest_at_the_Beach]

From ZDnet:

PC gaming comes to Ubuntu Linux with Steam client release

And there is a release of Ubuntu out today:

2013-02-14 Distribution Release: Ubuntu 12.04.2

[Ernest_at_the_Beach]

From the first link at #7:

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If that wasn't big enough news for gamers, Steam is also putting every Ubuntu-enabled title on sale for 50-75% off until Monday, February 21 at 10:00am PST. Their initial game offering consists of 60 games including such popular titles as Half-Life, Counter-Strike and the free to play Team Fortress 2. For hardcore Linux fans, "as a launch giveaway and for the hardcore gamers who need every item in Team Fortress, for a limited time when you play Team Fortress 2 on Ubuntu you will get a Tux penguin item to keep or trade."