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RubyGems Upgrade Issues
gem update --system is disabled on Debian. RubyGems can be updated using the official Debian repositories
This is due to using
apt-get install rubygems. We
recommend that you uninstall RubyGems via Aptitude and install it
from source. Further
instructions are here for doing so.
Rails requires RubyGems >= 1.3.1 (you have 1.2.0). Please
gem update –system and try again.
If you have updated Rails to 2.2 or 2.3 you will see an error similar to this (depending on what version of gems you have installed). However when you try run the command ‘gem update –system’ it will fail depending on what version of gem you have installed (well it doesn’t exactly fail, it just pleasantly tells you there was nothing to install, bug if you do a gems -v, it will still be 1.2.0).
The work around is:
gem install rubygems-update update_rubygems
(Credit goes to Mark Howe)