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HP network printer queue suddenly won't un-pause

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I've got an HP MFP M479 which has worked fine (driverless) for years. Last week I started having the same problem on two different Ubuntu 20.04 computers: when I try to print the print queue immediately pauses. Every time I hit "resume" it immediately re-pauses without printing anything.

The printer is still being autodetected correctly and scanning still works fine. The printing works fine from a Windows computer so I'm ruling out a hardware problem.

I've tried removing and re-adding the printer but no change. /var/log/cups/error_log just shows "Backend returned status 4 (stop printer)" each time the queue pauses.

How should I troubleshoot this?

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I had a similar problem with an HP LaserJet printer using ubuntu v22.04. I didn't delete any of the existing printers, just added a new printer allowing the system to identify which and then renamed it in `Printers`. Since then, the original drivers have worked fine.
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