Having just purchased a HP Officejet 6500A, the device gives a true plug and play experience on Ubuntu 11.10. However, one thing that did not work right out of the box was scanning one or more pages from the ADF ( automatic document feeder ). Scanning through the ‘simple’ glass scan plate worked fine, but trying to use the ADF did nothing. Ubuntu 11.10 comes with HPLIP version 3.11.7, but this particular issue has been addressed in HPLIP 3.11.10, which was not available as a .deb yet, until now! Just add my desktop PPA to your sources, upgrade hplip, and enjoy a flawless ADF scan experience 😉 Here’s the link.