title: How to remove this cronjob in ubuntu
body: <p>I'm running a webserver with PLESK and installed an extension 'kernel care' which I later on deleted. However, it installed a cronjob which sends me a mail every 4 hours:</p>
  
  <pre><code>Cron &lt;root@server&gt; /usr/bin/kcarectl --auto-update
  Unknown Kernel (Ubuntu 3.13.0-042stab123.9)
  </code></pre>
  
  <p>I ssh into the server and run crontab -l as root <strong>but don't see the specific cronjob</strong>. However, in /etc/cron.d there is a file kcare-cron and if I cat this file it shows</p>
  
  <pre><code>16 */4  * * * root /usr/bin/kcarectl --auto-update
  </code></pre>
  
  <p>So thats the one I want to delete. Can I just delete the file kcare-cron?</p>