I've been through all tutorials and solved problems I can find about RVM. There's something wrong with permissions. There are no rubies installed, and when I try to install one: "permission denied". I can't even do rvm implode without "permission denied".
Here is my detailed answer to this problem: http://stackoverflow.com/questions/9056008/installed-ruby-1-9-3-with-rvm-but-command-line-doesnt-show-ruby-v/9056395#9056395
There were few attempts to fix the ubuntu package - but nobody had enough time to finish it.