I think your sudo timeout ran out before the upgrade finished. Can you do the
following:
sudo aptitude purge hplip
Remove the hplip user in System -> Administration -> Users & Groups
sudo aptitude install hplip
Does that work?
** Changed in: hplip (Ubuntu)
Status: New => Incomplete
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package hplip 2.8.7-0ubuntu6 failed to install/upgrade:
https://bugs.launchpad.net/bugs/291285
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