One printer has HP DJ 1000 J110 drivers installed and it works.
The other printer is another story that requires a little advice.
The main driver is hplip-3.11.3a.run. During its installation run (sh hplip-3.11.3a.run), it cuts off with the following error message:
error: Configure failed with error: General / Unknown error.
Why?
Lucid Repositories combed for HP and CUPS programs, , 'hp-setup', and hplip-3.11.3a.run but to no avail. Printer and computer connected together "localhost".
I added the ppa Andrea mentions but 'hp-setup' says error: No devices found on bus: usb. computer/printer is connected to localhost and the Document Print Status box says job is processing but there is no output.
And I cannot think of anything else to report at this point. Your help will greatly be appreciated.