Kenshi Muto wrote: ...
I suspect your file hasn't any Printer line by something reason.
...Correct. I manually added a Printer line to /etc/cups/classes.conf and was then able to start cupsd.
I initially tried to use lpadmin, but that failed because it tries to communicate with cupsd. I found the documentation here:
http://www.cups.org/documentation.php/ref-classes-conf.html#Printer CUPS would therefore seem to have two bugs. * A classes.conf without a Printer line causes cupsd to crash. * cupsd allows you to create a class without any printers.