Looking here:
http://hplipopensource.com/hplip-web...ces/index.html
I don't specifically see the j6400, but many that start with j64**.
Anyway that's the first place to start.
I have had trouble with the packaged version of HPLIP in both Intrepid and Jaunty, so I've had to go to Synaptic Package Manager and remove hplip, and then download the newest HPLIP and use their Automatic installer:
http://hplipopensource.com/hplip-web...all/index.html
I should also add that to get the HP Device Manager (which will show up in Apps > Accessories) to work I've had to install the following packages:
Code:
sudo apt-get install libqt4-assistant libqt4-test ttf-dustin python-qt4-common libqt4-xmlpatterns libqt4-help python-qt3 python-qt4 libqt4-webkit python-sip4 libqt4-svg python-reportlab