As noted, this is almost certainly not a dpkg bug. Feel free to report again (preferably against a more appropriate package), with a transcript, if it recurs.
** Changed in: dpkg (Ubuntu) Status: Needs Info => Rejected -- Postinstall gunzip failure doesn't stop package install https://launchpad.net/bugs/46116 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs