sudo su
apt-add-repository -y ppa:rael-gc/rvm
apt-get update
apt install ruby ruby-dev rvm
usermod -a -G rvm $USER
reboot
rvm install 3.0.0
rvm use 3.0.0
sudo su
apt-add-repository -y ppa:rael-gc/rvm
apt-get update
apt install ruby ruby-dev rvm
usermod -a -G rvm $USER
reboot
rvm install 3.0.0
rvm use 3.0.0