This seems to be a race condition in debconf, not a bug in the postinst script (which doesn't do anything very interesting). I was able to reproduce it only once. The debconf frontend was blocked on read while the postinst script had exited and was a zombie.
(I don't really understand this behaviour as read on a pipe should return as soon as the process at the other end of the pipe exits. So it could even be a bug in the kernel, though that seems unlikely.) Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.
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