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System: Ubuntu 18.04
system-config-printer version: 1.5.11-1ubuntu
printer: Canon iP7250

I expect to be able to see the printer in the panel just as 'lpstat -l
-e' or 'driverless' can see them, without the need to especially add a
new printer.

And if I do need to add it (don't see why that should be the case, but
still), I expect that choosing the printer's name under network would
result in adding the printer.

What happened instead:

Canon iP7250 isn't shown in the Printers panel, clicking on add and
expanding the network options - it is shown, but when trying to add it
(either driverless IPP, LPD via DNS-SD or IPP via DNS-SD) it gives an
error about CUPS internal error.

`$ lpstat -l -e` gives
`Canon_iP7200_series network none 
ipp://Canon%20iP7200%20series._ipp._tcp.local/`

So the system does see it, and `lp -d Canon_iP7200_series
/etc/nsswitch.conf` does print (and for a minute the printer is shown in
the Printers panel - but then disappears).

I can add it by *not* clicking on the printer's name under Network, but
rather, click on ipp printer and manually choose Canon -> iP7200 ->
CUPS+Gutenprint driver (and not the recommended driverless option -
which, if I choose results in that same cryptic error I get when trying
to add the printer by clicking on it, as described above).

** Affects: cups (Ubuntu)
     Importance: Medium
         Status: Triaged

-- 
ipp printer isn't shown automatically - adding it errors with a CUPS internal 
error
https://bugs.launchpad.net/bugs/1815307
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