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If you have error like this:
$ steam
Running Steam on ubuntu 15.04 64-bit
STEAM_RUNTIME is enabled automatically
[2015-08-09 12:18:56] Startup - updater built Jul 23 2015 11:48:12
SteamUpdateUI: An X Error occurred
X Error of failed request: BadValue (integer parameter out of range for operation)
I have a solution for you:
$ rm ~/.steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6