/usr/share/cups/ppd-updaters/cups-filters.ppd-updater is in cups-filters 1.0.52-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | DRIVER_REGEXP='drv:///cupsfilters.drv/|lsb/usr/cupsfilters/'
GENNICKNAME_REGEXP=
|