For the love of God, next time please document it.

It costs me 3 days to figure out that the CUPS now needs cups-filter to handle file formats. My last version of CUPS is 1.4.0. which, if my recollection serves me right, does not need anything other than the .ppd file to print documents from anywhere. I googled it and googled it, very tired, day and night, all day long, and finally found an article that mentions cups-filter. The official document of CUPS should have documented this change.