As ippusbxd by itself is broken, meaning that it even does not work very
well with the devices it is actually designed for, I am also in favor of
removing it from all still supported Ubuntu versions (especially LTS).
Then it does not block devices which could otherwise work better.

To the users whose device needed ippusbxd we should tell to install the
ipp-usb Snap then, at it does the task of supporting IPP-over-USB
devices correctly and to their full extent.

ipp-usb Snap:

https://snapcraft.io/ipp-usb

ippusbxd replacement by ipp-usb:

https://github.com/OpenPrinting/ippusbxd#before-you-begin-ippusbxd-or-
ipp-usb

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1871011

Title:
  USB scanning and printing broken on focal by ippusbxd (was: hpmud and
  ippusbxd conflict)

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

Bug description:
  SOLUTION : sudo apt remove ippusbxd

  ---- Initial report -----

  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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