When you upgrade from one version of Ubuntu to the next, PPAs are disabled, because there's no way to ensure that the PPA contains packages for the version you're upgrading to. That's an expected behaviour.
The quote means that issues with firefox-esr from Jonathon's PPA should be reported to him, not as bugs against the official ubuntu package. I suggest you contact Jonathon (https://launchpad.net/~jonathonf/+contactuser) to discuss the issue with him. Feel free to engage in a conversation with him here, even though the bug is invalid it might be useful to others who use that PPA. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1812057 Title: Upgrade Lost Firefox ESR Status in firefox package in Ubuntu: Invalid Bug description: System was upgraded from Xubuntu 14 to 16 by DVD. It wiped out many things, including the installation of Firefox ESR. ESR was manually reinstalled, but there appears to be no integration with the former profiles. While they still exist, both Firefox Quantum and Firefox ESR see the exact same profiles. There appears to be no way to remedy the problem. No crash is involved. If -profilemanager is used in Firefox, the same choices appear in both versions. This was not the case prior to the upgrade. Description: Ubuntu 16.04.5 LTS Release: 16.04 firefox-esr: Installed: 52.9.0esr-1~16.04.york0 Candidate: 52.9.0esr-1~16.04.york0 Version table: *** 52.9.0esr-1~16.04.york0 500 500 http://ppa.launchpad.net/jonathonf/firefox-esr-52/ubuntu xenial/main amd64 Packages 100 /var/lib/dpkg/status firefox: Installed: 64.0+build3-0ubuntu0.16.04.1 Candidate: 64.0+build3-0ubuntu0.16.04.1 Version table: *** 64.0+build3-0ubuntu0.16.04.1 500 500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 100 /var/lib/dpkg/status 45.0.2+build1-0ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1812057/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp