Bluetooth CUPS backend: There was an error during the CUPS operation: 'client-error-not-possible'

After reading the bluez-cups source it seems the required format for device URIs is:

bluetooth://<MAC-address>/[spp | hcrp]

The same failure occurs using the "/spp" suffix.

The printer supports SPP (and works fine on Hardy):

sdptool records 00:04:76:BB:2D:03
Service Name: Serial Port
Service RecHandle: 0x10000
Service Class ID List:
  "Serial Port" (0x00001101)
Protocol Descriptor List:
  "L2CAP" (0x00000100)
  "RFCOMM" (0x00000003)
    Channel: 1

I'm not entirely clear if the following test is related to this issue. I tried directly invoking the bluez-cups backend to see if something might happen... it did - a failure. Whether this is the cause of the cups issue I do not know.

sudo -i
DEVICE_URI="bluetooth://00:04:76:BB:2D:03/spp" /usr/lib/cups/backend/bluetooth 1 tj Test 1 options

DEBUG: /usr/lib/cups/backend/bluetooth device 00:BA:0C:0E:0D:0B service auto fd 0 copies 1 class (none)
STATE: +connecting-to-device
ERROR: Can't open Bluetooth connection

That failure occurs in bluez/cups/main.c::main():

service_search:
 sdp = sdp_connect(BDADDR_ANY, &bdaddr, SDP_RETRY_IF_BUSY);
 if (!sdp) {
  fprintf(stderr, "ERROR: Can't open Bluetooth connection\n");
  return CUPS_BACKEND_FAILED;
 }

For me it is a problem of the Bluetooth backend, moving to the bluez package ...

I'm not convinced it is the bluetooth back-end. I've just done another test from a terminal using

system-config-printer --debug

It doesn't reveal anything outstanding but looking in /var/log/syslog I found this after selecting the HP device and pressing the 'Apply' button:

20:45:08 hephaestion python: hp-info[21176]: warning: No display found.
20:45:08 hephaestion python: hp-info[21176]: error: hp-info -u/--gui requires Qt4 GUI support. Entering interactive mode.
20:45:08 hephaestion python: hp-systray[21177]: warning: No display found.
20:45:08 hephaestion python: hp-systray[21177]: error: hp-systray requires Qt4 GUI and DBus support. Exiting.
20:45:12 hephaestion python: hp-info[21176]: warning: Unable to connect to dbus. Is hp-systray running?
20:45:12 hephaestion python: hp-info[21176]: error: Unexpected error. Exiting.

the error makes obvious there is a permission problem, are you member of lp-admin?
to have more debug output from CUPS, could you connect to http://localhost:631/admin and active the debug options. Restart the cups server, and redo the steps, in order to have more logs.

Thanks

changing to package cups

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates.

This was reported against a now obsolete release so I'm going to close the report. If you still have this issue, please feel free to reopen it or report a new bug on a supported release.