Install RVM and Ruby

rvm, virutualenv

Remove ubuntu's ruby-rvm

sudo apt-get --purge ruby-rvm

Install 

curl -L https://get.rvm.io | bash -s stable
rvm list known
rvm install 1.9.3-head

Configuration (.bashrc)

 PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting

source /home/victor.yang/.rvm/scripts/rvm