I\'m running Ubuntu 12.04 LTS, and installed Ruby via RVM.
The problem is, when I type ruby -v into the terminal, it says that my Ruby version is
ruby -v
Run this command:
rvm get stable --auto-dotfiles
and make sure to read all the output. RVM will tell you if something is wrong, which in your case might be because GEM_HOME is set to something different then PATH.
RVM
GEM_HOME
PATH