Seems very odd, here it works<p><pre><code>  clemme@ubuntu:~ $ hostname -f
  ubuntu

  clemme@ubuntu:~ $ cat &#x2F;etc&#x2F;lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=16.04
  DISTRIB_CODENAME=xenial
  DISTRIB_DESCRIPTION=&quot;Ubuntu 16.04 LTS&quot;</code></pre>