John, are you sure that is due to wrong permissions in /var/cache/cups? Can you please copy the output of
ls -lR /var/cache/cups/ here? -- cannot write /var/cache/cups/ppds.dat https://launchpad.net/bugs/40795 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
