title: gitlab: how to update to latest minor version
body: <p>I tried to update my gitlab-CE from 10.3.2 to the latest one (currently the 11.4). And it gives me this honestly safe error. </p>
  
  <pre><code>[...]
  gitlab preinstall: It seems you are upgrading from 10.x version series
  gitlab preinstall: to 11.x series. It is recommended to upgrade
  gitlab preinstall: to the last minor version in a major version series first before
  gitlab preinstall: jumping to the next major version.
  gitlab preinstall: Please follow the upgrade documentation at https://docs.gitlab.com/ee/policy/maintenance.html#upgrade-recommendations
  gitlab preinstall: and upgrade to 10.8 first.
  dpkg: error processing archive /var/cache/apt/archives/gitlab-ce_11.2.3-ce.0_amd64.deb (--unpack):
   subprocess new pre-installation script returned error exit status 1
  Errors were encountered while processing:
   /var/cache/apt/archives/gitlab-ce_11.2.3-ce.0_amd64.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  
  root@this-vm# apt-cache policy gitlab-ce | grep Installed
    Installed: 10.3.2-ce.0
  </code></pre>
  
  <p>But how to install to the latest minor version ? The documentation they are referring to, doesn't say how to do it. 
  Do you guys encounter any problem like this ? </p>