Comment 56 for bug 102675

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Scott James Remnant (Canonical) (canonical-scott) wrote :

I don't think this has anything to do with the contents of /etc/network/interfaces, since ifup won't bother with devices that don't exist.

This is far more likely to be caused to the recent ifupdown update that adjusted the udev rules to try and stop it altering ppp devices, and has uncovered a udev bug.