I got this gem error on Ubuntu 6.06 over and over then finally I followed these instructions to install Ruby on Rails,
Install Ruby on Rails on Ubuntu 6.06
and I changed one line:
sudo gem update --system IS WRONG!!!!
run:
sudo gem update
and thing all the sudo gem installs work perfectly fine for me. Why I have no idea. I hate computers sometimes, but at least ruby and rails now work for Ubuntu 6.06 on my system.
