title: Can't run postgres on my system. It's showing `postgres is not in the sudoers file. This incident will be reported.`
body: <p>I'm trying to install postgres on my WSL Ubuntu. Installation is finished but when I run <code>psql</code> the following error is displayed.</p>
  <p><code>psql: error: could not connect to server: could not connect to server: No such file or directory</code>
  <code>Is the server running locally and accepting</code>
  <code>connections on Unix domain socket &quot;/var/run/postgresql/.s.PGSQL.5432&quot;?</code></p>
  <p>And when I run <code>sudo find /var/run/postgresql/.s.PGSQL.5432</code> to find the file, it's showing another error like this.</p>
  <p><code>postgres is not in the sudoers file.  This incident will be reported.</code></p>
  <p>It'll be more clear from the screenshot.</p>
  <p>How to continue? Please help...</p>
  <p><strong>Screenshot:</strong></p>
  <p><a href="https://i.stack.imgur.com/VKh1S.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VKh1S.png" alt="reference" /></a></p>