Comment 5 for bug 1794142

Some additional information

Host System 16.04.4
MAAS VM 18.04 and 18.04.1
MAAS Version 2.4.2 (also seen on 2.4 beta)

The cisco setup is more up-to-date but here is some additional information on an older setup that I have seen this on.

$ cat version.txt
maas-cert-server:
  Installed: 0.3.1-0~201805011616~ubuntu18.04.1
  Candidate: 0.3.5-0~201809070116~ubuntu18.04.1
  Version table:
     0.3.5-0~201809070116~ubuntu18.04.1 500
        500 http://ppa.launchpad.net/hardware-certification/public/ubuntu bionic/main amd64 Packages
 *** 0.3.1-0~201805011616~ubuntu18.04.1 100
        100 /var/lib/dpkg/status
maas:
  Installed: 2.4.0~beta2-6865-gec43e47e6-0ubuntu1
  Candidate: 2.4.2-7034-g2f5deb8b8-0ubuntu1
  Version table:
     2.4.2-7034-g2f5deb8b8-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
 *** 2.4.0~beta2-6865-gec43e47e6-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status