Please uninstall ippusbxd. Then your device should work with HPLIP
normally. ippusbxd wa supposed to allow driverless printing and scanning
without HPLIP. Unfortunately there were problems in its design.

In Groovy we will replace ippusbxd by ipp-usb which finally allows
driverless printing and scanning without HPLIP to work reliably.

See bug 1891157.

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https://bugs.launchpad.net/bugs/1871011

Title:
  USB scanning broken on focal --> hpmud and ippusbxd conflict

Status in HPLIP:
  Invalid
Status in hplip package in Ubuntu:
  Expired

Bug description:
  On Ubuntu 20.04 focal (with -proposed enabled). HPLIP=3.20.3.

  Previously there was a libmtp (udev) bug erroneously detecting HP
  printers as mtp devices. This was fixed. Now, I can try to scan-- from
  both simple-scan and hp-scan, hplip errors out:

  
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 427: Found 
interface conf=0, iface=1, altset=0, index=1
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 389: Active 
kernel driver on interface=1 ret=0
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 515: invalid 
claim_interface 7/1/2: Device or resource busy
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 427: Found 
interface conf=0, iface=0, altset=1, index=3
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 389: Active 
kernel driver on interface=0 ret=0
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 515: invalid 
claim_interface 7/1/4: Device or resource busy
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 427: Found 
interface conf=0, iface=3, altset=0, index=9
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 389: Active 
kernel driver on interface=3 ret=0
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 515: invalid 
claim_interface ff/4/1: Device or resource busy
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 427: Found 
interface conf=0, iface=0, altset=0, index=11
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 389: Active 
kernel driver on interface=0 ret=0
  Apr 05 21:27:37 dani-mbp15 simple-scan[3464]: io/hpmud/musb.c 515: invalid 
claim_interface ff/cc/0: Device or resource busy

  Printer/scanner is an Officejet 4635. Scanning previously worked just
  fine a few months ago. Regression?

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