Install RVM + Rails

Manage Ruby versions (production or not using RVM). Trust me, been there and installing it otherwise is not a walk in the park...

1~$ gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
2~$ curl -sSL https://get.rvm.io | bash -s stable
3~$ curl -sSL https://get.rvm.io | bash -s stable --rails

RVM Already Installed But Without Rails

Make sure gem is installed under ~/.rvm. You should see something like below:

1~$ which gem
2/home/user/.rvm/rubies/ruby-3.0.0/bin/gem

and install rails

1~$ gem install rails

Once installation is complete, you should be able to verify rails version installed. Something like this:

1~$ rails --version
2Rails 7.0.2.2

See updated version in RVM website