Thank you for taking the time to report this issue and help to improve Ubuntu.
As documented at <https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Bonded%20network%20interfaces%20must%20use%20hotplug-style%20configuration>, you must use the hotplug-style configuration in /etc/network/interfaces; specifying the bond slaves in the bond interface stanza will not work. If you create the correct stanzas for eth1 and eth2, does this problem still occur?
Thank you for taking the time to report this issue and help to improve Ubuntu.
As documented at <https:/ /wiki.ubuntu. com/LucidLynx/ ReleaseNotes# Bonded% 20network% 20interfaces% 20must% 20use%20hotplug -style% 20configuration>, you must use the hotplug-style configuration in /etc/network/ interfaces; specifying the bond slaves in the bond interface stanza will not work. If you create the correct stanzas for eth1 and eth2, does this problem still occur?