Aaron, the problem is the following:
If CUPS is asked for listing PPDs ("lpinfo -m" or equivalent IPP call),
the returned paths are not necessarily real file system paths. They are
more to understand as PPD URIs. To get safely any arbitrary PPD CUPS
reports to you, you have to ask CUPS to give you the PPD. either by
using "lpadmin" with the "-m" option and exactly the PPD URI as listed
by "lpinfo -m" or by polling the PPD from CUPS via an appropriate IPP
call. See the code of system-config-printer (in Ubuntu and Fedora) for a
possible Python implementation.
--
Fax PPD not installed by default
https://bugs.launchpad.net/bugs/59409
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