rbenv and bundler: "bad interpreter: No such file or directory"

Question

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.

Answer 1

Find the bundle executable (in a non project directory - default system ruby) and delete it:

which bundle

rm <path_obtained_above>

Now go to your project directory, or switch to your ruby version and install bundler:

gem install bundler

Then execute rbenv rehash

and now try executing bundle install and it should work. You will need to do this once for each ruby version installed.

Answer 2

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:

• ~/.profile
• ~/.bashrc
• ~/.bash_profile
• ~/.gemrc

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.