Comment 14 for bug 44931

Merely creating the directory with

  sudo mkdir /etc/cups/ssl
  sudo chown cupsys /etc/cups/ssl

was enough for me to get it running. Creating the certificate and key was a matter of seconds.

However, to integrate our snakeoil SSL certificate support, we need to do the following (as root):

  mkdir /etc/cups/ssl
  ln -s /etc/ssl/certs/ssl-cert-snakeoil.pem /etc/cups/ssl/server.crt
  ln -s /etc/ssl/private/ssl-cert-snakeoil.key /etc/cups/ssl/server.key
  adduser cupsys ssl-cert

and then restart cupsys.