This seems to be somewhat difficult to reproduce, but it looks like its dependant on the unpack/configure order that apt is selecting. postfix copies the file in place in the postinst. If both are unapcked and the postinst of postfix-doc is run before the one postfix then this error can happen (that is my current theory :)
This seems to be somewhat difficult to reproduce, but it looks like its dependant on the unpack/configure order that apt is selecting. postfix copies the file in place in the postinst. If both are unapcked and the postinst of postfix-doc is run before the one postfix then this error can happen (that is my current theory :)