How to use systemctl in Ubuntu 14.04
<p>I try to perform the following command in Ubuntu 14.04:</p>

<pre><code>systemctl enable --now docker-cleanup-dangling-images.timer
</code></pre>

<p>I also tried it with sudo, I tried to replace systemctl with service and systemd but nothing works</p>

<pre><code>sudo: systemd: command not found
systemd: command not found
sudo: service: command not foud
</code></pre>

<p>How can I execute this command in Ubuntu 14.04 or is there another way to execute the same command?</p>