Mine is as follows:
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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
auto eth0
iface eth0 inet dhcp
pre-up /sbin/ifconfig $IFACE mtu 1400
-----------
The forum thread linked to in the first comment has others from users
with the same problem.
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network has to be started each time system is booted
https://launchpad.net/bugs/50099
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