rvm issue

"You need to change your terminal emulator preferences to allow login shell."

http://stackoverflow.com/questions/10939968/why-wont-my-rvm-allow-me-to-switch-to-an-alternative-ruby

The Problem

RVM does its own installation magic, but in Ubuntu's case it doesn't always install to the right Bash startup file. You probably don't actually have RVM running properly; even though it's sort of installed.

The Fix

You need to make sure the following two lines are at the BOTTOM of your ~/.bashrc file.

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"
export PATH=$PATH:$HOME/.rvm/bin

Then restart your terminal emulator or log back in. Note that sourcing ~/.bashrc has been known not to work in some cases, so this step will save your sanity.

RVM should now be working properly. The last step is to set your default Ruby.

rvm --default use 1.9.2

Important Edit

As I've just been reminded, RVM breaks Ubuntu login shells by installing ~/.bash_login, which overrides your Ubuntu ~/.profile in login shells. Move the code over to your ~/.bashrc if you haven't already done so, then remove or rename ~/.bash_login.