After having discovered RVM and realizing how much easier it makes your life (application specific gemsets are pure genuis), I couldn’t get it to work on the my desktop while it was fine on the laptop.
gem kept looking in /var/lib/gems/1.8 and it turns out there is quite a few
GEM_HOME are being (or can be) set on your Linux
In my case it was the first 3 and after removing
from those files, RVM started working.