Ruby on Rails

Version hell...I have the latest version of gems installed and gems -v
proves this, but somewhere an old copy is hanging about - how do I get
rid of this old version? This is driving me nuts!

I seem to be getting conflicted installations of gems:

For example

$ ruby script/generate model product
Rails requires RubyGems >= 1.3.2 (you have 1.2.0). Please `gem update
--system` and try again.

brett@ubuntu:~/RoR/Apps/OpenBenefit/depot$ gem update --system
ERROR: While executing gem ... (RuntimeError)
gem update --system is disabled on Debian. RubyGems can be updated
using the official Debian repositories by aptitude or apt-get.

brett@ubuntu:~/RoR/Apps/OpenBenefit/depot$ gem -v
1.3.5
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