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Half a year ago I was fed up with windows and decided to install Xubuntu. I first tried a live system of Focal Fossa, but my printer, an HP Officejet Pro X451dw wouldn't work. I found out, that it does with Bionic Beaver, installed it and worked happily with it since. Yesterday I decided to upgrade to Focal Fossa, because the support for Bionic Beaver will run out soon. But unfortunately, the problem reoccurred. The printing utility detects the printer, but I can't print. I get a notification, that the printer is not connected, which is definitely wrong. I have disconnected the USB cable and reconnected it to varying USB slots, but that didn't change anything. I removed the printer from the printing utility and reinstalled it, without success. I ran troubelshooting and got the following protocol:

I [03/Mär/2021:08:18:41] io/hpmud/musb.c 427: Found interface conf=0, iface=0, altset=0, index=1
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 389: Active kernel driver on interface=0 ret=0
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 515: invalid claim_interface 7/1/2: Device or resource busy
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 427: Found interface conf=0, iface=0, altset=1, index=3
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 389: Active kernel driver on interface=0 ret=0
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 515: invalid claim_interface 7/1/4: Device or resource busy
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 427: Found interface conf=0, iface=2, altset=0, index=9
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 389: Active kernel driver on interface=2 ret=0
I [03/Mär/2021:08:18:41] io/hpmud/musb.c 515: invalid claim_interface ff/4/1: Device or resource busy
E [03/Mär/2021:08:18:41] prnt/backend/hp.c 825: INFO: open device failed stat=21: hp:/usb/HP_Officejet_Pro_X451dw_Printer?serial=CN4CDJX05B; will retry in 30 seconds...
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 427: Found interface conf=0, iface=0, altset=0, index=1
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 389: Active kernel driver on interface=0 ret=0
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 515: invalid claim_interface 7/1/2: Device or resource busy
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 427: Found interface conf=0, iface=0, altset=1, index=3
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 389: Active kernel driver on interface=0 ret=0
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 515: invalid claim_interface 7/1/4: Device or resource busy
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 427: Found interface conf=0, iface=2, altset=0, index=9
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 389: Active kernel driver on interface=2 ret=0
I [03/Mär/2021:08:19:50] io/hpmud/musb.c 515: invalid claim_interface ff/4/1: Device or resource busy
E [03/Mär/2021:08:19:50] prnt/backend/hp.c 825: INFO: open device failed stat=21: hp:/usb/HP_Officejet_Pro_X451dw_Printer?serial=CN4CDJX05B; will retry in 30 seconds...

Does anybody know a solution to my problem? May I use Focal Fossa with an older version of the printing utility? How dangerous would it be to reinstall Bionic Beaver and continue using it, after the support runs out?

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  • I would discourage you from mixing and matching across Ubuntu versions. It's probably worth your time to solve the problem with Focal Fossa instead. By printing utility, I presume you meant cups? Have you installed hplip, which is also an Ubuntu package called hplip? (Maybe the GUI hplip-gui package would also help?)
    – Ray
    Mar 30, 2021 at 8:04
  • I have been told at freenodes webchat, that I need to remove ippusbxd to resolve a conflict and have run "sudo apt purge ippusbxd" and "sudo rmmod ippusbxd" and rebooted the computer, but it had no effect. I still can't print and still get the notification "printer possibly not connected"
    – Ecki
    Mar 30, 2021 at 18:17
  • When I install the printer, the printing utility says: "connection: HP Linux Imaging and Printing (HPLIP)" Doesn't that mean hplip is installed? How can I get hplip-gui?
    – Ecki
    Mar 30, 2021 at 18:40
  • The OfficeJet Pro X451dw should work OOTB on Focal. See wiki.debian.org/CUPSQuickPrintQueues
    – brian_p
    Mar 30, 2021 at 22:34
  • Try sudo apt update; sudo apt install hplip hplip-gui. You've also installed cups?
    – Ray
    Mar 31, 2021 at 3:08

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Yesterday I have finally discarded Xubuntu and installed Linuxmint. I am very happy with the decision. Printing worked at once, the documentation and instructions are much more detailed, a higher emphasis on security and the best of all: The LTS - Version I have installed will be supported until April 2025! A stable system for 4 years, thank goodness!

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