I think this may be caused by having locally-built/upgraded perl modules. This can be fixed after the upgrade is over by running CPAN and manually upgrading your perl modules. Then do:
apt-get update apt-get upgrade and you'll have a finished upgrade to 16.04, including spamassassin. Complete sequence of commands I used to fix the problem, finish the 16.04 upgrade, and get spamassassin working again: cpan upgrade quit apt-get update apt-get upgrade sa-compile spamd [-whateveryoulike] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1565398 Title: package sa-compile 3.4.1-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 25 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/spamassassin/+bug/1565398/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
