Ok, I think I got something. It's working in bionic, and in eoan I got:

root@nsnx:~# /usr/lib/cups/backend/smb smb://10.10.1.6/ds216laser 34 root "Test 
Page" 1 "job-uuid=urn:uuid:efa8b6df-0724-3252-4657-11e6ac474646 
job-originating-host-name=localhost date-time-at-creation= 
date-time-at-processing= time-at-creation=1574951400 
time-at-processing=1574952123" .bashrc 
kerberos_ccache_is_valid: Failed to get default principal from ccache: 
FILE:/tmp/krb5cc_0
DEBUG: This backend requires credentials!
DEBUG: get_exit_code(nt_status=NT_STATUS_ACCESS_DENIED [c0000022])
ATTR: auth-info-required=none
DEBUG: Unable to connect to CIFS host: NT_STATUS_ACCESS_DENIEDroot@nsnx:~# 

That's something I can work with.

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Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1849859

Title:
  error when connecting to smb server

Status in cups package in Ubuntu:
  Confirmed
Status in samba package in Ubuntu:
  Confirmed
Status in system-config-printer package in Ubuntu:
  Confirmed

Bug description:
  when I connect to smb server (nas) permanently appears

  "Error while getting peer-to-peer dbus connection: Operation was
  cancelled"

  The printer at this NAS doesn't work too.

  "held for authentication KeyError: 'auth-info-required'"

  The same printer at usb port works fine.

  Ubuntu development version 20.04
  system-config-printer version 1.5.11-4ubuntu1
  smbclient version 2:4.10.7+dfsg-0ubuntu3

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1849859/+subscriptions

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