Printing problems after upgrade to F30

[Jouk Jansen]

Hi all

I just upgraded from F29 to F30. All looks fine except printing from the
system. The printer is configured in /etc/cups/printers.conf (see details
below). I noticed that in a previous file the "Shared" was set to Yes, but
all the other lines are exactly the same.

if I try to pront from the system the job is held in the queue telling me
that there is a problem with authentication (but the authentication is
included in the prints.conf file). If I look in the printer set=up menu
which can be started from the "gnome-to-panel" it tells me that the job
needs autentication and it asks met to enter credentials, but I cannot input
them from this menu: Where should I enter them?

If I try to reconfigure the printer via cups and indicate that the printer
is to be shared, I get the message that sharing is not possible for a
Kerberos-printer. On this system I never configured Kerberos. So what is
happening here?

Please help me getting printing working on this machine as it worked before
the upgrade to F30.

Regards
                Jouk

excerpt form /etc/cups/printers.conf:

<Printer Xerox-openvpn>
UUID urn:uuid:8ee24042-e404-351f-434a-aa18ab969e10
AuthInfoRequired negotiate
Info Xerox-openvpn
Location Alanalul
MakeModel Xerox AltaLink C8035
DeviceURI smb://DASTUD\username:[e-mail]/FollowMe
State Idle
StateTime 1556698864
ConfigTime 1540381212
Type 8433916
Accepting Yes
Shared No
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
Option sides two-sided-long-edge
</Printer>

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    (free after Marcus Tullius Cicero (106 b.Chr.-46 b.Chr.)
     Epistularum ad Atticum 7.1.4.3)

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[Berend De Schouwer]

On Wed, 2019-05-01 at 11:48 +0200, Jouk Jansen wrote:
> If I try to reconfigure the printer via cups and indicate that the
> printer
> is to be shared, I get the message that sharing is not possible for a
> Kerberos-printer. On this system I never configured Kerberos. So what
> is
> happening here?

I've got an identical problem.  I've filed a bug report here:
https://bugzilla.redhat.com/show_bug.cgi?id=1700791

I think it was caused by:
https://bugzilla.redhat.com/show_bug.cgi?id=1662408

I don't think it's triggered by "Shared"; but rather by
"AuthInfoRequired" that changes from None or Username,Password to
Negotiate.

To work around it, here's what I did:
- move /usr/lib/cups/backend/smb to /usr/lib/cups/backend/smb.real
- write a script /usr/lib/cups/backend/smb to replace it:

#!/bin/sh
cat - | /usr/lib/cups/backend/smb.real "${@}"

Remember to make it executable.  You'll notice this just calls
smb.real.  The actual change is that this script exits with 0, so Cups
never sees an error.  Suddenly it doesn't trigger AuthInfoRequired, and
actually prints.

NOTE: this will be overwritten every time cups is upgraded.  The
workaround can be smarter if you change DeviceURI to something else
(say smbworks://) and create a script accordingly.

I do this at work for a printer that has every non-SMB port firewalled.