I messed up my configuration. I am running Ubuntu 14.04 and had some issues when I tried to move from a project to an other. I tried to uninstall and reinstall rbenv and then installed Ruby 2.1.7 following this guide: https://gorails.com/setup/ubuntu/14.04.
Now, when I run gem install bundler nothing happens and I can't install any gems. When I type bundler or bundler -v I see this:
/usr/local/bin/bundler: /usr/bin/ruby1.9.1: bad interpreter: No such file or directory
I spent many hours trying to solve this but I really don't know what to do.
The fact that gem is being executed by your /usr/local/bin means that rbenv isn't in your $PATH correctly.
Step 1:
Please delete any references you have of rbenv in the following areas:
Step 2:
Reinstall rbenv using these instructions. It won't override, it will simply update changes to your ~/.bash_profile. Once reinstalled close your terminal and reopen. Everything should work correctly at that time.
Step 3:
Verify that everything was installed correctly by executing cat ~/.bash_profile. You should see the following. If you do, you're good to go.
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
Many cudos to @theTinMan for recently helping me sort through my rbenv installation.