Setup GEM_HOME for your ruby gems installation in Ubuntu
I found this setup is pretty helpful when working with Rails projects in Ubuntu (it's 14.04 in this case): Add these lines at the end of ~/.bashrc : export GEM_HOME=$HOME/ruby/gems export GEM_PATH=$GEM_HOME:/lib/ruby/gems/1.9.3 export GEM_CACHE=$GEM_HOME/cache export PATH=$PATH:$HOME/ruby/gems/bin To get affected right away: $ source ~/.bashrc