Steps to reinstall rvm in ubuntu

Uninstall RVM – do the following

unset GEM_HOME

rvm implode

rm -rf ~/.rvm

rm -rf /usr/share/rvm

sudo rm /etc/profile.d/

sudo rm /etc/rvmrc

sudo rm ~/.rvmrc

vim ~/.zshrc  # or ~/.bash_profile related to machine/software you use and remove rvm related lines

Install RVM:

sudo apt-get install build-essential

unset rvm_path

sudo apt install gnupg2

Goto and add gpg keys to verify

gpg --keyserver hkp:// --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
\curl -sSL | bash -s stable

If the following error occurs while adding keys:

➜ gpg --keyserver hkp:// --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
gpg: connecting dirmngr at '/run/user/1000/gnupg/S.dirmngr' failed: IPC connect call failed
gpg: keyserver receive failed: No dirmngr

then do:

sudo apt-get update

then you will get some errors regarding the keys, add those keys to following command:

gpg --keyserver hkp:// --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

then do:

\curl -sSL | bash -s stable

Make sure that your ~/.bash_profile or ~/.zshrc file contains the following lines to load rvm to the shell:

# RVM manual script for loading rvm to shell
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" 

After installing RVM check by:

➜ rvm list

# No rvm rubies installed yet. Try 'rvm help install'.

➜ rvm install 2.7.2
Searching for binary rubies, this might take some time.
Found remote file
Checking requirements for ubuntu.
Requirements installation successful.
ruby-2.7.2 - #configure
ruby-2.7.2 - #download
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.7.2 - #validate archive
ruby-2.7.2 - #extract
ruby-2.7.2 - #validate binary
ruby-2.7.2 - #setup
ruby-2.7.2 - #gemset created ~/.rvm/gems/ruby-2.7.2@global
ruby-2.7.2 - #importing gemset ~/.rvm/gemsets/global.gems..................................
ruby-2.7.2 - #generating global wrappers.......
ruby-2.7.2 - #gemset created ~/.rvm/gems/ruby-2.7.2
ruby-2.7.2 - #importing gemsetfile ~/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.7.2 - #generating default wrappers.......

➜ rvm list
=* ruby-2.7.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

➜ rvm gemset list

gemsets for ruby-2.7.2 (found in ~/.rvm/gems/ruby-2.7.2)
=> (default)

➜ rvm gemset create foobar
ruby-2.7.2 - #gemset created ~/.rvm/gems/ruby-2.7.2@foobar
ruby-2.7.2 - #generating foobar wrappers.......

➜ rvm gemset list              

gemsets for ruby-2.7.2 (found in ~/.rvm/gems/ruby-2.7.2)
=> (default)

➜ rvm gemset use foobar
Using ruby-2.7.2 with gemset foobar

➜ rvm gemset list           

gemsets for ruby-2.7.2 (found in ~/.rvm/gems/ruby-2.7.2)
=> foobar

➜ rvm list gemsets

rvm gemsets

   ruby-2.7.2 [ x86_64 ]
=> ruby-2.7.2@foobar [ x86_64 ]
   ruby-2.7.2@global [ x86_64 ]

For preserving the gemset for the current directory create .rvmrc file:

vim .rvmrc
# add this: rvm --rvmrc use foobar

If rvm is not loading into the shell after changing the terminal preferences, check the rvm_path env variable.

zsh: no such file or directory: /usr/share/rvm

If you don’t have that directory you must change the above path to a correct rvm installed path.

By default rvm installed in this path: ${HOME}/.rvm So you can add this path to rvm_path

So set it like:

export rvm_path="${HOME}/.rvm"

You can add this line into your ~/.zshrc OR ~/.bash_profile file.

You can check rvm env variables and info by:

env | grep rvm  
rvm info

Check ruby version by: ruby -v If ruby is not loading try to add the following line into your bash_profile:

export PATH=~/.rvm/gems/ruby-2.7.2/bin:$PATH # change version: ruby-2.7.2 to your installed version
source ~/.bash_profile OR source ~/.zshrc # whatever you use
ruby -v