Installed games showing as not installed

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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.
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Why are my Steam games not showing as installed?
Games may appear uninstalled when Steam no longer recognizes the installation files. As long as the affected game's folder is still in the proper location, attempting to launch the game will prompt a download. This will allow Steam to recognize the installation files during the download process.How do I get Steam to recognize installed games?
Hit the Windows key, type Steam, then open it. Go to Games. Select and click on Install for the game that Steam has failed to recognize. Steam will start to discover existing files for the game.How do I get origin to recognize already installed games?
In this case what you'll want to do is install Origin and then change your Downloaded Games location to match your existing games hard drive location. Do this and restart Origin, and it should detect the games.How do I find my installed games?
Find new games or games you've playedHow To Fix Steam Showing Games as Uninstalled (Easy Fix)
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Henry & Co., alexander ermakov, Pavel Danilyuk, Yan Krukov