I have a dual boot computer, 64 bit Windows 7 and 64 bit Ubuntu 13.04. I have Steam installed on my computer on the Windows 7 side, however I also use it from the Ubuntu side via Wine as well. When I was trying to start Portal 2 on the Ubuntu side however, a "completing installation" window came up. After the game's loading got to one percent it returned this error:

The Steam servers are too busy to handle you request for Portal 2. Error code (2)

So I went to the Steam Powered site and looked up the error code and it said the fallowing:

Many of these issues were tied to FAT32 drives which has been
corrected in a Steam update. Some users have also reported moving the
Steam installation to the default C: Drive will correct this issue.
If the issue persists, please contact Steam Support.

So I updated Steam and it still gives me this error. I would contact Steam support but it's natively for windows and mac only and I'm using Ubuntu so they cant help me. Any suggestions?

EDIT: To clarify, I can NOT just install the Linux version of Steam, as the game I want to play is not compatible with Linux. Thus, it won't let me download it or install it.