RVM is not a function, selecting rubies with 'rvm use …' will not work

List the ruby versions

ubuntu@ubuntu:~$ rvm list

rvm rubies

=* ruby-2.3.0 [ x86_64 ]

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

Try to use a specific version of ruby

ubuntu@ubuntu:~$ rvm use 2.3.0@rails230

RVM is not a function, selecting rubies with 'rvm use ...' will not work.

You need to change your terminal emulator preferences to allow login shell.
Sometimes it is required to use `/bin/bash --login` as the command.
Please visit https://rvm.io/integration/gnome-terminal/ for an example.

 

Solution:

Type bash --login from your terminal. And then give rvm use 2.3.0@rails230