Comment 4 for bug 541595

Somehow I doubt we would have so many duplicates if it was only triggered by a system crash... I wonder if the disconnect between's APT's view and dpkg's view doesn't come from some event that is not reported via the status fd (or reported but ignored/missed by APT).

Or maybe dpkg itself being stupid... it could get a request to configure several packages, but the process of configuring one in facts configures several because the other were only waiting for the trigger processing and when it tries to configure the others, it complains because they are already configured.