I can confirm that I have had this issue from just before upgrading to 10.04 from 9.10. I am able to get printing functionality back when I run 'sudo /etc/init.d/cups start' but this needs to be done every time the computer is booted. I have also run 'sudo update-rc.d cups enable' and the service was confirmed added but absent from the subsequent boot.
I can confirm that I have had this issue from just before upgrading to 10.04 from 9.10. I am able to get printing functionality back when I run 'sudo /etc/init.d/cups start' but this needs to be done every time the computer is booted. I have also run 'sudo update-rc.d cups enable' and the service was confirmed added but absent from the subsequent boot.