Public bug reported: On upgrade from 14.04.05 to 16.04.2 using do-release-upgrade, I got this error:
dpkg: cycle found while processing triggers: chain of packages whose triggers are or may be responsible: man-db -> systemd packages' pending triggers which are or may be unresolvable: ca-certificates: update-ca-certificates man-db: /usr/share/man systemd: /etc/init.d dpkg: error processing package ca-certificates (--remove): triggers looping, abandoned ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/ca-certificates.0.crash' Error in function: Upgrade was not successful, lsb_release -a reported 16.04.02 but the system was obviously not fully upgraded, and the network adapter was disabled according to lshw. Couldn't get online to try and repair so rolled back to a previous snapshot. ubuntu-release-upgrader-core: Installed: 1:0.220.9 ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1700574 Title: dpkg: error processing package ca-certificates To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1700574/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs