title: Correcting my Linux $PATH of multiple rbenv paths
body: <p>I am fresh to Linux Ubuntu and I have messed up my Ruby on Rails install.
  Therefore, I uninstalled Ruby and attempted to follow the <a href="https://github.com/rbenv/rbenv#installing-ruby-versions" rel="nofollow noreferrer">rbenv installation.</a>
  However, I am getting this stack trace:</p>
  <pre><code>martin@martyux:~$ curl -fsSL https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-doctor | bash
  Checking for `rbenv' in PATH: multiple
    You seem to have multiple rbenv installs in the following locations.
    Please pick just one installation and remove the others.
  
    /home/martin/.rbenv/bin/rbenv
    /usr/bin/rbenv
    /bin/rbenv
  
  Checking for rbenv shims in PATH: not found
    The directory `/home/martin/.rbenv/shims' must be present in PATH for rbenv to work.
    Please run `rbenv init' and follow the instructions.
  
  Checking `rbenv install' support: /home/martin/.rbenv/plugins/ruby-build/bin/rbenv-install (ruby-build 20210119)
  Counting installed Ruby versions: none
    There aren't any Ruby versions installed under `/home/martin/.rbenv/versions'.
    You can install Ruby versions like so: rbenv install 2.2.4
  Checking RubyGems settings: OK
  Auditing installed plugins: OK
  </code></pre>
  <p>I am assuming that there's instances of rbenv I attempted to install earlier and somehow is still linked to $PATH. I didn't find anyone with this exact issue and I am not competent at navigating the Unix shell yet, so I would appreciate some thorough help.</p>