"Add new printer" refuses to add a second networked LaserJet if it's same model

[JOna]

"Add new printer" refuses to add a second networked LaserJet if it is same model and has only different IP.

Steps to reproduce:
1) make a clean install of Edubuntu Dapper Flight 5
2) Log in and add first networked printer HP LaserJet 4000N. OK.
3) Notice that you cannot change the name of the printer, it is named after the driver e.g. "LaserJet-4000-Series-Postscript-(recommended)". This is not OK. I have several LaserJet 4000:s in this network.
4) Try to add another HP LaserJet 4000N that has different IP. Nothing happens.
5) Try to add another HP LaserJet 5000 (=different model). OK.
6) Open Firefox and go to Cups admin page http://localhost:631/. Here you can remove oddly named printers and install them all with the names you prefer.