Ubuntu 15.04 64bit under steam does not start

First look at the steam log, under/tmp/dumps/, named "User name _output.txt".

cat /tmp/dumps/15.10- for AppID (steam)/version (  1457636973) Libgl error:unable to load Driver:r600_dri.solibGL error:driver pointer missinglibgl error:failed To load DRIVER:R600LIBGL error:unable to load Driver:swrast_dri.solibGL error:failed to load Driver:swrast

The reason is that the lib file of steam is too old, find the ending method is deleted can, I personally is recommended backup.

RM ~/.local/share/steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so. 6  rm ~/.local/share/steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libgcc_s.so. 1

Reference:

1.https://bbs.archlinux.org/viewtopic.php?id=183659

See first floor, "Finally, I have tried removing libgcc_s.so.1 from/home/devin/.local/share/steam/ubuntu12_32/steam-runtime/i386/ Lib/i386-linux-gnu And/home/devin/.local/share/steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu as Advised on https://github.com/valvesoftware/steam-... ssues/3280 with the same results. "

Ubuntu 15.04 64bit under steam does not start