Ubuntu 20.04 CUPS HP Printer io/hpmud/jd.c 94: unable to read device-id

ubuntu-cups-hp-unable-read-device-id.txt

The following error message is logged to /var/log/syslog by hpcups and indicates that the CUPS subsystem
is attempting to query the SNMP 'public' community name to retrieve printer device information.

io/hpmud/jd.c 94: unable to read device-id

Unfortunately this stops the hp cups subsystem from printing with the following error in /var/log/syslog

prnt/backend/hp.c 825: INFO: open device failed stat=12: hp:/net/HP_LaserJet_P2035n?ip=10.10.0.25; will retry in 30 seconds...

A look at the code base for jd.c shows that an SNMP query failure generates the "unable to read device-id" error message

https://fossies.org/linux/hplip/io/hpmud/jd.c

My solution to this issue was to open the HP LaserJet configuration web page, go to the SNMP settings 
and select "Enable SNMP v1/v2 read-only access (uses 'public' for the Get Community Name)

Then CUPS was restarted (systemctl stop cups; systemctl start cups) and printing of the documents in queue commenced
with no further errors in /var/log/syslog.

Than you thank you thank you. I had disabled snmp v1/v2 and forgotten about it. Then my printer wouldn't work. This fixed it!

Glad you found the information helpful.

Glad you found the information helpful.

Oh thank you, found this solution today, in my case the culprit was checkbox "Disable SNMPv1/v2 default Get Community Name of 'public'." which I checked recently.

After I unchecked this, the printer started working immediately.