When i had ubuntu 14.04 LTS the steam and dota2 were fine and i was playing with hours.
But since when i upgraded to ubuntu 14.10 the steam doesn't open and neither any steam games.
I reinstall it but nothing again! It doesn't show anything. Just doesn't open.
I found the answer on http://chakraos.org/forum/viewtopic.php?id=13247
You have to do the following on terminal and if it doesn't work:
Go to the folder and found the first file and deleted it. The second file maybe it's not appearing.
Open steam and wait to update.
And it will work!
I too had the same problem.
I fixed my issue by reinstalling Steam by downloading the official Steam .deb pkg & using
sudo dpkg -i steam_latest.deb
Then I switched to the latest video driver (nvidia~>361.42) under
Lastly, I rebooted & that seemed to fix Steam!
Not sure if this played a part in fixing my issue, but I also installed package xserver-xephyr with