The installation of puppet-master-passenger fails when installed at the same time puppetdb is installed. I found a workaround by installing puppetdb first, followed by puppet-master-passenger. This installation conflict never occurred in the past when I installed puppetmaster-passenger and puppetdb at the same time on Ubuntu 16.04. The software mirror I used for successful installation was obtained from apt.puppetlabs.com/puppetlabs-release-pc1-xenial.deb. This installation conflict started with the new puppet-master-passenger package obtained from apt.puppetlabs.com/puppet6-release-bionic.deb.
Travis L. Bean I believe it is expected for pc1 and puppet6 release packages to conflict. I don't know why it didn't conflict earlier. Note the puppet-master-passenger package went EOL in October 2018 along with everything else in the pc1 repo (puppet-agent 1.x, puppet 4.x, puppet-server 2.x, etc). I'm going to move this to the CPR project and close it.