An effective workaround would be to rebuild the packages for all supported series sequentially, to ensure the build IDs are in ascending order.
Currently, at least for amd64, they are reversed: $ grep -r --include="application.ini" BuildID | sort 16.04/usr/lib/firefox/application.ini:BuildID=20190517141553 18.04/usr/lib/firefox/application.ini:BuildID=20190517140819 18.10/usr/lib/firefox/application.ini:BuildID=20190517140354 19.04/usr/lib/firefox/application.ini:BuildID=20190517140251 19.10/usr/lib/firefox/application.ini:BuildID=20190517114929 ** Changed in: firefox (Ubuntu) Assignee: (unassigned) => Olivier Tilloy (osomon) ** Changed in: firefox (Ubuntu) Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1830096 Title: Firefox 67 in Ubuntu 18.10 thinks it's an older version To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1830096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs