Everyone with the problem described here (HP printer with duplex unit does not print double-sided) please follow the instructions in the section "CUPS error_log" of https://wiki.ubuntu.com/DebuggingPrintingProblems. Thanks.
** Changed in: hplip Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/416513 Title: duplex printing no longer works for OfficeJetPro 8500 with HPLIP > 3.9.6b To manage notifications about this bug go to: https://bugs.launchpad.net/hplip/+bug/416513/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs