I have my printer working again, for how long I don't know but here is what I did. I had hplip 3.14.3-0ubuntu3.2 installed. I removed it and installed hplip 3.15.2 from source, did not work, completely removed it by 'make uninstall', installed 3.14.6 from source, same thing, completely uninstalled, same thing with 3.14.10 from source. I then reinstalled the hplip 3.14.3-0ubuntu3.2 package, rebooted the system and printer worked on the first try. I can't say whether it will continue to work but it is for now.
I have my printer working again, for how long I don't know but here is what I did. I had hplip 3.14.3-0ubuntu3.2 installed. I removed it and installed hplip 3.15.2 from source, did not work, completely removed it by 'make uninstall', installed 3.14.6 from source, same thing, completely uninstalled, same thing with 3.14.10 from source. I then reinstalled the hplip 3.14.3-0ubuntu3.2 package, rebooted the system and printer worked on the first try. I can't say whether it will continue to work but it is for now.