Ruby install tricks

$ rvm get stable

# if there is a problem with getting the latest version run:

$ rvm get head
$ rvm reload
$ rvm get stable

# if that does not work try:
$ \curl -sSL https://get.rvm.io | bash -s stable
$ rvm reload

# you need to restart your terminal here 

$ rvm list known
# shows the list of all installed rubies

$ rvm remove ruby_version

$ rvm install ruby-2.6.0 (set your version here)
$ ruby -v (shows you the version that rvm is currently using)

# just in case to make sure that you are using the right version run:

$ rvm use ruby-2.4.2 --default