At the moment the main NM package has a hard dependency on pppd, which
pulls in a lot of other dependent packages.
It would be better to move the PPP support into a NM plugin that can
be loaded dynamically when needed, and ship the plugin in a separate,
Feature now available upstream (see GNOME bugzilla entry).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.