title: mysqld.sock missing after server restart; MySQL server fails to start
body: <p>I manage a local intranet website which runs on Ubuntu. Now, each time I restart the server, the mysqld.sock and mysql.sock files seem to disappear. This causes the MySQL server to not start. </p>
  
  <p>Is this a common problem? Each time, I have to re-install the MySQL server and client to have it appear again.</p>