It is not necessary to reinstall the OS. Just reinstalling CUPS should do the trick and restore the original cupsd.conf. Please run the following commands in a terminal to do that:
$ sudo dpkg --purge --force-depends cupsys $ sudo apt-get install cupsys -- Cups Can't set up a new espon c86 printer (USB) https://launchpad.net/bugs/65794 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
