Comment 7 for bug 329228

After recently upgrading my system to Ubuntu 10.04, I had the same problem:
Broadband connection did not work, NetworkManager complained about: pppd options error,
and pppd said:: Plugin /usr/lib/pppd/2.4.4/nm-pppd-plugin.so is for pppd version 2.4.5, this is 2.4.5
Weirdly, /usr/lib/pppd/2.4.4/nm-pppd-plugin.so was identical to /usr/lib/pppd/2.4.5/nm-pppd-plugin.so

This apparently very version-sensitive plugin architecture seems to be pretty broken.
As someone wrote in https://bugzilla.redhat.com/show_bug.cgi?id=548520#c20
"If ppp updates to 2.4.6 tomorrow, then you'll be right back in the same problem."

This bug has cost me many precious hours, and still I do not have a good solution, which is pretty frustrating for end-users like me
My current workaround is to manually downgrade to ppp 2.4.4, network-manager0.7, libnm-util0 0.7
where trying to satisfy all the resulting dependency problems is a pain in the butt :-(