After I upgraded to Dapper, my printer stopped working. /var/log/cups/error_log gave me this error:
E [19/Jun/2006:12:01:40 +0530] cupsdAuthorize: Local authentication certificate not found!
I looked at a lot of threads on ubuntuforums and a lot of results on google. Finally I deleted my printer, and added it again. And now, it works. Just finished printing a test page. Boy, them test pages sure suck up a lot of ink!!