ou have broken version of RVM - Ubuntu does something to RVM that produces lots of errors, the only safe way of fixing for now is to:
sudo apt-get --purge remove ruby-rvm
sudo rm -rf /usr/share/ruby-rvm /etc/rvmrc /etc/profile.d/rvm.sh
open new terminal and validate environment is clean from old rvm settings (should be no output):
env | grep rvm
if there was output, try to open new terminal, if it does not help - restart computer
install RVM:
curl -L get.rvm.io | bash -s stable --auto
do not forget to read rvm requirements before installing rubies