title: Error while logging as root in ubuntu
body: <p>When I try to change user to root, I get below error</p>
  
  <pre><code>➜  ~  su
  Password: 
  Cannot execute /usr/local/bin/fish: No such file or directory
  </code></pre>
  
  <p>Any idea how do I get rid of this? I do not have fish installed now. I had installed it earlier.</p>