I concur with the HP assessment expressed in other msgs. I've had an HP LasterJet Pro p1606dn duplex laser for five years and it has been installing and running faultlessly. Let me add one caveat. Use the 14.04.2 release of Kubuntu. During the install check the option to add proprietary software like mp3 drivers but DO NOT click the option to do updates while installing. The reason deals with the HPLIP app. The 14.04.2 release uses the older HPLIP GUI, written by HP. The updates bastardize it with a castrated version which does not show the five tabs the original HP app shows, so if you have a laser you can no longer see how much toner you have remaining, etc.... So, BEFORE you click that "updates available" icon in the system tray open a konsole and enter "sudo apt-get update" followed by "sudo apt-get install muon". With muon, not the fancy Muon Discovery app, install the HPLIP and HPLIP GUI apps and all their dependencies and such. Set up your printer. I used muon to lock that version of HPLIP and HPLIP GUI.
THEN you can click the updates.
THEN you can click the updates.
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