>From my point of view the bug should be closed somehow. As I understand MFP 
>M28 uses closed source protocols from Apple (AirScan) and Microsoft (WP-scan) 
>for scanning, therefore the scanning plugin form HP is closed source and 
>Ubuntu developers can do little with it, otherwise MFP M28 linux users, who 
>can push HP directly to fix the problem. The workaround solution 
>(sane-airscan/current SANE) are open source and based on reverse engineering 
>specification of the protocol. My opinion that the proper way of fixing the 
>issue is not to do something in the plugin, but asap include a new version of 
>SANE to next Ubuntu release and/or backported SANE airscan to current Ubuntu 
>if possible.
P.S. As many other users of HP, I absolutely disappointed of such "good 
quality" drivers from the vendor. I hope it will change in the future.

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https://bugs.launchpad.net/bugs/1811504

Title:
  Scan with HP LaserJet Pro MFP M28a fails

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