CupsErrorLog:
 E [09/Jan/2013:16:03:04 +0100] Unknown directive SystemGroup on line 16 of /etc/cups/cupsd.conf.
 E [09/Jan/2013:16:03:04 +0100] "/etc/cups/ssl/server.crt" is a bad symlink - No such file or directory
 E [09/Jan/2013:16:03:04 +0100] "/etc/cups/ssl/server.key" is a bad symlink - No such file or directory
 E [09/Jan/2013:16:07:29 +0100] Unknown directive SystemGroup on line 16 of /etc/cups/cupsd.conf.
 E [09/Jan/2013:16:07:29 +0100] "/etc/cups/ssl/server.crt" is a bad symlink - No such file or directory
 E [09/Jan/2013:16:07:29 +0100] "/etc/cups/ssl/server.key" is a bad symlink - No such file or directory