Comment 9 for bug 1571174

16:30 <infinity> rbasak: It's not your fault (not apt's), it's ufw's. Or, more annoyingly, it's that we need to sort out how to upgrade ufw early.

16:33 <infinity> rbasak: Fixing this specific case could be done by having squid Breaks << the new ufw, but that's a lie. If the upgrades are happening in the right order, I can do the Breaks from dpkg, but that might not help wily->xenial. I'll ponder a fix that will more globally be correct.