Install Printer (HP Laserjet CP1525nw)

Go to "System" > "Administration" > "Printing".

Then from the window that opens up, you choose "Add", then click "Network Printer" and "Find Network Printer", then wait about 5-10 seconds, and you should see the "HP LaserJet CP1525nw" listed twice.

Choose the one that has the IP-address of the printer in round brackets. The one with the Mac address in round brackets will not work.

Click "Forward" and then pick "HP" from the list, click "Forward" again, then pick "Color LaserJet" from the list, and the driver "HP Color LaserJet Series PCL 6 CUPS".

Click "Forward", and "Forward" a second time since we have no duplexer on this unit, and finally choose a name (or use the pre-filled one if you like) and finally click "Apply". Now you can print a test page, and then you are done!

Thanks to odinb: http://ubuntuforums.org/showthread.php?t=1650424