title: Gpg key server showing 'gpg: keyserver receive failed: No dirmngr' while installing rvm
body: <p>I am trying to install rvm in my Ubuntu 18.04.2 LTS and am getting error while installing gpg keys. </p>
  
  <p>Command:</p>
  
  <pre><code>gpg --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>gpg: connecting dirmngr at '/run/user/1000/gnupg/S.dirmngr' failed: IPC connect call failed
  gpg: keyserver receive failed: No dirmngr
  </code></pre>
  
  <p>dirmngr is installed.</p>