Thank you for your bug report.
Does restarting hplip followed by cups give any difference:
$ sudo /etc/init.d/hplip restart
$ sudo /etc/init.d/cupsys restart
Can you add the output of command hp-info run from a terminal as
attachment.
** Changed in: gnome-cups-manager (Ubuntu)
Status: Unconfirmed => Needs Info
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Printer not detected HP no_device_found
https://launchpad.net/bugs/49366
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