This is an rvm issue. Suggestions on rvm home page did not work. Solution: Uninstall rvm and use rbenv to manage ruby versions.
Add the following to ~/.bashrc
[[ -s "$HOME/.profile" ]] && source "$HOME/.profile" # Load the default .profile
eval "$(rbenv init -)"
Say 'Yes' to the prompt.
which bundle showed no output. Run: gem install bundle