We have just made Portal 2 available in Beta form on Linux; to access it, you need to opt into the Beta from the Portal 2 properties in your Steam Library.
We look forward to your feedback; head to our dedicated tracker to report issues and look at know issues:
https://github.com/ValveSoftware/portal2/issues
Валвовцы молодцы!
//UPD 7.3 GB тянуть
