steam
Everything was working perfectly until a week ago.
But one day, i started Steam, go to my Library. And saw all of my installed games are showing as not installed. Also when i try to to install them Steam says i don't have any disk space. But i do!!
My OS: Ubuntu 14.04.2
What i tried
Uninstalling, manually removing all the data in ~/.steam and ~/.local/share/steam and re-installing
Tried to contact Steam Support, but no response.
As of the latest update to Steam, you can now PERMANENTLY remove games from your Steam account!
You can browse over your entire library and choose which software you'd like to permanently get rid of. But note, once you have removed a game from your library, it's gone permanently, so if later down the road you'd like it back you'll have to purchase it again.
You'll also need to watch out for some other issues. The thread linked above has noted that if the game is part of a bundle (HumbleBundle, etc.), removing one game from a "package" may require you to remove all the games from that specific bundle.
Steam has probably made a library folder on the drive that you installed the Steam client on. If you don't have any games on that drive and don't intend to ever install any on it, go to Steam>Settings>Downloads>Steam Library Folders, select the library folder of the drive you don't want to install any games whatsoever to, and click "Remove".
Furthermore, you can use the same method (except you click "Add" and not "Remove") to add another Steam library folder.
Best Answer
It looks like this was a bug related to Ubuntu's kernel 3.13.0-59, and was found documented and discussed on Steam's Github repo. The bug prevented Steam from accessing it's own library folders.
Ubuntu has since updated the kernel again to 3.13.0-61 and this update will resolve the issue.