Public bug reported:

While running an upgrade, we see errors of the form

apt: unknown dependency error

This is very similar to the error in lp:1668583 and using "Request
upgrade" which runs dist-upgrade does allow upgrades to complete.

Looking for sources in backports does not throw up anything.

$ for in in $(COLUMNS=200 dpkg -l | awk '{print $2}')
do 
apt-cache policy $i | awk '/500 http/ { print $3 }'
done | sort -u 

stable/main
xenial/main
xenial/multiverse
xenial/restricted
xenial-security/main
xenial-security/multiverse
xenial-security/restricted
xenial-security/universe
xenial/universe
xenial-updates/main
xenial-updates/multiverse
xenial-updates/pike/main
xenial-updates/restricted
xenial-updates/universe

$ lsb_release -rd
Description:    Ubuntu 16.04.6 LTS
Release:        16.04

$ apt policy landscape-client
landscape-client:
  Installed: 17.03~bzr940-0~941~ubuntu16.04.1
  Candidate: 17.03~bzr940-0~941~ubuntu16.04.1
  Version table:
 *** 17.03~bzr940-0~941~ubuntu16.04.1 500
        500 http://ppa.launchpad.net/landscape/17.03/ubuntu xenial/main amd64 
Packages
        100 /var/lib/dpkg/status
     16.03-0ubuntu2.16.04.6 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
     16.03-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

** Affects: landscape-client (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1819822

Title:
  upgrades fail with errors of the form apt: unknown dependency error

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