Could not find rails (>= 0) amongst [] (Gem::LoadError)

Question

After installing rvm, updating .gmrc file, updating rubygems and running gem install rails -v \">=3.1.0rc\", I now seem to have a complete mess:

Answer 1

remove ruby first then

sudo apt-get install build-essential libssl-dev libreadline5 libreadline5-dev zlib1g zlib1g-dev

to install all needed lib then you could install ruby and rails

rvm install 1.9.3
rvm --default use 1.9.3
rvm gem install rails