Why 'dokku plugins-install' doesn't work as expected?
<p>I'm trying to use simple <code>dokku plugins-install</code> command, but my system replies me with:</p>
<blockquote>
<p><code>plugins-install</code> is not a dokku command.</p>
<p>See <code>dokku help</code> for a list of available commands.</p>
</blockquote>
<p>What might be the problem here?</p>