Thanks for the info Rob.
I think I understand the problem now.

Forget about the workaround I mentioned before by setting up a raw queue
on the server.

When setting up an IPP printer with gnome-cups-manager on a print client you 
always have to associate a PPD with it by selecting the manufacturer, model and 
driver for your printer.
This doesn't make sense for a network printer, since you have already 
configured the manufacturer, model and driver on the print server.

To make it work you can setup your printer manually with the following command:
$ lpadmin -p printername -E -v ipp://10.0.0.40/printers/dj3820

Another possibilty is to activate browsing on the server to let your print 
client autodetect the printers.
You can easily enable browsing on an Ubuntu print server by running the 
following command:
$ sudo /usr/share/cups/enable_browsing 1
Then start gnome-cups-manager on the print client an activate Global settings > 
Detect LAN printers. Now wait 30 seconds and your printers will appear.

In both cases you will see that the "Paper" and "Advanced" tabs are
disabled in the "Properties" of you printer in gnome-cups-manager, this
is normal.

Associating a PPD with an IPP printer with gnome-cups-manager worked in CUPS 
1.2.0 and 1.2.1, this behaviour seems to have changed in CUPS 1.2.2.
This could be a bug in CUPS 1.2.2, but IMHO setting up an IPP printer 
associated with a PPD file doesn't make sense since you already configured the 
printer on the server. Therefore gnome-cups-manager should be altered so it 
doesn't ask the manufacturer, model and driver for an IPP printer.
Also printing options should be visibile in the "Paper" and "Advanced" tab of 
the printer "Properties". These options should be read from the server which is 
perfectly possible now from the following command line:
$ lpoptions -d printername -l
These printer options are set on the server but gnome-cups-manager should allow 
for an override on the client in ~/.cups/lpoptions.

-- 
1.2.0-0ubuntu5 to 1.2.2-0ubuntu0.6.06 breaks Brother HL-1440
https://launchpad.net/bugs/55828

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