Problem

After a new rvm installation in an (k)ubuntu system you get the following error from rvm when trying to switch between rubies:

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 a example.

Solution

As the message suggests you can change the setting in your terminal which is fine if you are using the gnome-terminal by going to the link provided:

Please visit https://rvm.io/integration/gnome-terminal/ for a example.

but if you are using Konsole in KDE you need to go to a different link that explains the change in the settings:

Please visit http://rvm.io/integration/konsole/ for a example.