To be honest - I'd start with installing latest version of Ubuntu first. Then - if Steam is 32bit application you'll need to install 32bit versions of some libraries - including libc.
– JacekMar 09 '16 at 15:43
Ubuntu 12.10 is no longer supported and therefore, this question is off-topic here. Please upgrade to a currently supported version of Ubuntu (12.04, 14.04, 15.10 and 16.04 in a few weeks)
– Wayne_YuxMar 09 '16 at 16:37