Comment 27 for bug 183968

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

If you deleted it, there's no way to get it back.

Deleting it will cause your interface names to change on the next reboot; thus any manual configuration for your network will be lost or (worse) confused between the different cards.

On a desktop machine with Network Manager, this tends not to matter, but on servers it can be very bad.