It looks like that your printer got detected under more than one IP
addresses. This causes two entries for your printer to appear in system-
config-printer. Only one of the IPs is recognized by HPLIP, so one entry
does not contain a suitable connection type for using the scanner.

Is the printer connected by wireless or by wired network or by both? If
by both, do your wireless and wired networks have different IP address
spaces?

Thank you for the screenshots. What I need now is to know which entries
are exactly in the "Connection" lists of each device entry (first wizard
page) for your printer.

Can you post or attach the output of the following commands (If a
command does not exit, stop it with Ctrl + C after some seconds, if a
command gives an error, post the output including the error message and
continue with the other commands):

/usr/lib/cups/backend/snmp
/usr/lib/cups/backend/dnssd
lpinfo -l -v
avahi-browse -a -r -t -k

The "/usr/lib/cups/backend/snmp" and "avahi-browse -a -r -t -k" should
contain IP addresses for your printer (something like "192.168.2.110")
in your printer's entries. Are they always the same or do different
commands return different IP addresses? Run the following commands with
<IP> replaced by each of the obtained IP addresses for your printer:

hp-makeuri <IP>
hp-mkuri -i <IP>


DO NOT compress or tar any attached files.

-- 
When configuring HP PSC2510 printer scanner, scanner not setup
https://bugs.launchpad.net/bugs/440767
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