It was bl**dy app-armor preventing cupsd from reading /etc/krb5.keytab (required by PAM/Krb5) and apparantly preventing it writing a ticket cache into /tmp.
used aa-complain /usr/sbin/cupsd to disable AppArmor enforcement and that's fixed the problem.
I wonder how many other ubuntu/CUPS random crash bugs are due to AppArmor?...
*sigh*
This bug may be marked as closed - BUT if you care, you might consider disabling AppArmour, or putting in a big fat hairy warning on the CUPS webpages about it.
I have a solution!
It was bl**dy app-armor preventing cupsd from reading /etc/krb5.keytab (required by PAM/Krb5) and apparantly preventing it writing a ticket cache into /tmp.
used aa-complain /usr/sbin/cupsd to disable AppArmor enforcement and that's fixed the problem.
I wonder how many other ubuntu/CUPS random crash bugs are due to AppArmor?...
*sigh*
This bug may be marked as closed - BUT if you care, you might consider disabling AppArmour, or putting in a big fat hairy warning on the CUPS webpages about it.
Cheers
Tim