I followed this [wiki.dreamhost.com/RVM](http://wiki.dreamhost.com/RVM "wiki page")‎ (and others) and the problem is simple: 
I can have a sudo user from panel that can't do anything with my web site. But my usual user can't run as a superuser. 
So there is no way so far that I get rvm to install on my vps.

I'm tired of searching, can anyone help me to solve this?