title: Deploy a release on maven central
body: <p>I would like to publish my Java program on maven central.
  Uploading from a SNAPSHOT also worked. But when I try to publish a release I always get the following error message.</p>
  <pre><code>Nexus Staging Rules Failure Report
  [ERROR] ==================================
  [ERROR]
  [ERROR] Repository &quot;xxxxx&quot; failures
  [ERROR]   Rule &quot;signature-staging&quot; failures
  [ERROR]     * No public key: Key with id: (xxxxx) was not able to be located on http://keyserver.ubuntu.com:11371. Upload your public key and try the operation again.
  </code></pre>
  <p>Then i tried to upload my key to the server with the following comand.</p>
  <pre><code>gpg --keyserver http://keyserver.ubuntu.com --send-keys xxxxx
  </code></pre>
  <p>Then i got this error.</p>
  <pre><code>gpg: WARNING: nothing exported
  gpg: skipped &quot;xxxxx&quot;: Not found
  gpg: keyserver send failed: Not found
  </code></pre>
  <p>Does anyone have an idea what it could be?</p>