$ ls -lR /var/cache/cups /var/cache/cups: total 3344 drwxr-xr-x 4 cupsys lp 0 2006-05-11 10:49 ppd -rw------- 1 cupsys lp 3412992 2006-05-18 19:05 ppds.dat /var/cache/cups/ppd: total 0 -- cannot write /var/cache/cups/ppds.dat https://launchpad.net/bugs/40795