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install rvm ubuntu 20.04

## Installing RVM with the latest Rails
# Install or update GPG
sudo apt update
sudo apt install gnupg2

# Request the RVM project’s public key to verify the legitimacy of your download
gpg2 --keyserver hkp://keyserver.ubuntu.com --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

# Download the RVM installation script from the project’s website
curl -sSL https://get.rvm.io -o rvm.sh

# If you would like to audit the contents of the script before applying it
nano rvm.sh

# Pipe it to bash to install the latest stable Rails version which will also 
# pull in the associated latest stable release of Ruby.
cat rvm.sh | bash -s stable --rails

# Source the RVM scripts from the directory they were installed
source ~/.rvm/scripts/rvm

install rvm ubuntu 20.04

RVM have dedicated Ubuntu package, so please follow instructions posted here: https://github.com/rvm/ubuntu_rvm