title: "GitLab is not responding." 502 on Ubuntu 14.04 after starting server
body: <p>I have just installed GitLab on a fresh Ubuntu 14.04 64 bit server. I did so using the Omnibus package as indicated in the <a href="https://about.gitlab.com/downloads/" rel="noreferrer">download page</a>. There were no error messages during the install and all the remarks from the script were displayed in green.</p>
  
  <p>When I access the server through port 80 I get the following:</p>
  
  <p><img src="https://i.stack.imgur.com/40TPT.png" alt="enter image description here"></p>
  
  <p>Following the <a href="https://github.com/gitlabhq/gitlab-public-wiki/wiki/Trouble-Shooting-Guide" rel="noreferrer">Trouble Shooting Guide</a> I tried to query the status, but the result is also an error:</p>
  
  <pre><code>sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
  sudo: bundle: command not found
  </code></pre>
  
  <p>I tried to access the logs but the <code>unicorn.stderr.log</code> file is nowhere to be found in the system.</p>
  
  <p>There is <a href="https://stackoverflow.com/questions/24350526/installing-gitlab-on-ubuntu-12-04">a similar question</a> with the same error on Ubuntu 12.04, to which the solution is to increase the unicorn timeout. I have tried to do so but the error message remains.</p>