Closure isn't available for Steam on Linux, so this isn't a steam bug.
The bug you're experiencing is that steam still offers to install it despite its unavailability, and that bug has been reported.
Interesting, thank you for this information.
@ccoffey:
You can find all the supported games in the Steam Store:
http://store.steampowered.com/search/?os=linux&category1=998
Nothing extracted yet.
Initially I installed Closure via the Ubuntu Software Center and it works great. I am now trying to add it to my Steam library. I get the following error.
OS: Ubuntu 12.04
Steam: Dec 19 2012, at 14:14:29
Steam API: v012
I have also tried removing Closure via the Ubuntu Software Center and then downloading it via Steam, the results is the same error.