Comment 2 for bug 1393832

It took me a while to figure out how to reproduce this reliably; at first I could reproduce it only in the context of autopkgtest, but not in a minimal schroot. It took some strace analysis to figure it out. This is not a dpkg bug after all.

What's happening here is that apache2 in Ubuntu ships ufw profiles, which means that it fires the ufw trigger, but only if ufw is installed (so in order to reproduce this in a minimal schroot you first need to install ufw). This causes apache2 to have "Status: install ok triggers-awaited" rather than the more usual "Status: install ok installed".

I've uploaded apache2 to tolerate the "triggers-awaited" and "triggers-pending" states here. I expect this to clear these autopkgtest failures.