I believe I'm experiencing the same/related issue. With Ubuntu10.04 and hplip-3.10.9, gedit does not allow duplex printing. However, I *am* able to duplex print from Firefox. I tried to specify the hpijs driver as described above (#27) but only the hpcups driver was listed. Not sure if this matters ... I also have installed cups-pdf. hp-check -r output: HP Linux Imaging and Printing System (ver. 3.10.9) Dependency/Version Check Utility ver. 14.3 Copyright (c) 2001-9 Hewlett-Packard Development Company, LP This software comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to distribute it under certain conditions. See COPYING file for more details. Note: hp-check can be run in three modes: 1. Compile-time check mode (-c or --compile): Use this mode before compiling the HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies are installed to successfully compile HPLIP. 2. Run-time check mode (-r or --run): Use this mode to determine if a distro supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball has the proper dependencies installed to successfully run. 3. Both compile- and run-time check mode (-b or --both) (Default): This mode will check both of the above cases (both compile- and run-time dependencies). Saving output in log file: hp-check.log Initializing. Please wait... --------------- | SYSTEM INFO | --------------- Basic system information: Linux d420nix 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:26:08 UTC 2010 i686 GNU/Linux Distribution: ubuntu 10.04 Checking Python version... OK, version 2.6.5 installed Checking PyQt 4.x version... OK, version 4.7.2 installed. Checking for CUPS... Status: scheduler is running Version: 1.4.3 error_log is set to level: warn Checking for dbus/python-dbus... dbus daemon is running. python-dbus version: 0.83.0 ------------------------ | RUNTIME DEPENDENCIES | ------------------------ Checking for dependency: CUPS - Common Unix Printing System... OK, found. Checking for dependency: GhostScript - PostScript and PDF language interpreter and previewer... OK, found. Checking for dependency: PIL - Python Imaging Library (required for commandline scanning with hp-scan)... OK, found. Checking for dependency: PolicyKit - Administrative policy framework... OK, found. Checking for dependency: PyQt 4 DBus - DBus Support for PyQt4... OK, found. Checking for dependency: Python DBus - Python bindings for DBus... OK, found. Checking for dependency: Python libnotify - Python bindings for the libnotify Desktop notifications... OK, found. Checking for dependency: Python XML libraries... OK, found. Checking for dependency: Python 2.3 or greater - Required for fax functionality... OK, found. Checking for dependency: Reportlab - PDF library for Python... OK, found. Checking for dependency: SANE - Scanning library... OK, found. Checking for dependency: scanimage - Shell scanning program... OK, found. Checking for dependency: xsane - Graphical scanner frontend for SANE... OK, found. ---------------------- | HPLIP INSTALLATION | ---------------------- Currently installed HPLIP version... HPLIP 3.10.9 currently installed in '/usr/share/hplip'. Current contents of '/etc/hp/hplip.conf' file: # hplip.conf. Generated from hplip.conf.in by configure. [hplip] version=3.10.9 [dirs] home=/usr/share/hplip run=/var/run ppd=/usr/share/ppd/HP ppdbase=/usr/share/ppd doc=/usr/share/doc/hplip-3.10.9 icon=/usr/share/applications cupsbackend=/usr/lib/cups/backend cupsfilter=/usr/lib/cups/filter drv=/usr/share/cups/drv/hp # Following values are determined at configure time and cannot be changed. [configure] network-build=yes pp-build=no gui-build=yes scanner-build=yes fax-build=yes dbus-build=yes cups11-build=no doc-build=yes shadow-build=no hpijs-install=no foomatic-drv-install=no foomatic-ppd-install=no foomatic-rip-hplip-install=no hpcups-install=yes cups-drv-install=yes cups-ppd-install=no internal-tag=3.10.9.11 restricted-build=no ui-toolkit=qt4 qt3=no qt4=yes policy-kit=no hpijs-only-build=no lite-build=no udev-acl-rules=yes hpcups-only-build=no hpijs-only-build=no Current contents of '/var/lib/hp/hplip.state' file: # hplip.state - HPLIP runtime persistent variables. [plugin] installed=0 eula=0 Current contents of '~/.hplip/hplip.conf' file: [last_used] printer_name = working_dir = . device_uri = "hp:/net/Officejet_J6400_series?zc=HPE468D3" [commands] scan = /usr/bin/simple-scan %SANE_URI% [installation] version = 3.10.9.11 date_time = 10/20/2010 14:12:44 [settings] systray_messages = 1 systray_visible = 1 [fax] email_address = voice_phone = [refresh] rate = 30 enable = false type = 1 [polling] enable = false device_list = interval = 5 -------------------------- | DISCOVERED USB DEVICES | -------------------------- No devices found. --------------------------------- | INSTALLED CUPS PRINTER QUEUES | --------------------------------- Officejet_J6400 --------------- Type: Printer Device URI: hp:/net/Officejet_J6400_series?zc=HPE468D3 PPD: /etc/cups/ppd/Officejet_J6400.ppd PPD Description: HP Officejet j6400 Series, hpcups 3.10.9 Printer status: printer Officejet_J6400 is idle. enabled since Wed 20 Oct 2010 01:58:10ready to print Communication status: Good Officejet_J6400_fax ------------------- Type: Fax Device URI: hpfax:/net/Officejet_J6400_series?zc=HPE468D3 PPD: /etc/cups/ppd/Officejet_J6400_fax.ppd PPD Description: HP Fax hpcups Printer status: printer Officejet_J6400_fax is idle. enabled since Wed 20 Oct 2010 01:23:42 PM EDT Communication status: Good ---------------------- | SANE CONFIGURATION | ---------------------- 'hpaio' in '/etc/sane.d/dll.conf'... OK, found. SANE backend 'hpaio' is properly set up. Checking output of 'scanimage -L'... device `hpaio:/net/Officejet_J6400_series?zc=HPE468D3' is a Hewlett-Packard Officejet_J6400_series all-in-one --------------------- | PYTHON EXTENSIONS | --------------------- Checking 'cupsext' CUPS extension... OK, found. Checking 'pcardext' Photocard extension... OK, found. Checking 'hpmudext' I/O extension... OK, found. Checking 'scanext' SANE scanning extension... OK, found. --------------- | USER GROUPS | --------------- meonline adm lp dialout cdrom plugdev lpadmin admin sambashare vboxusers ----------- | SUMMARY | ----------- No errors or warnings. Done.