[Ubuntu] Ubuntu に rubygems をインストール

RubyOnRails - Community Help Wiki を参考に

% sudo aptitude install rubygems

~/.bashrcに下記を追加

export PATH=/var/lib/gems/1.8/bin:$PATH

%sudo gem install rubygems-update
%sudo /var/lib/gems/1.8/bin/update_rubygems     note: this will clean out your gems!
% gem --version
1.3.6

■参考
Ubuntu/Ruby - TOBY SOFT wiki
http://blog.netblue.jp/2010/03/07/ruby-gem1-3-6-update-problem-on-ubuntu-9-10/