Comment 3 for bug 726769

I ran into this today as well (in my auto-upgrade-tester), here is the output of sh -x on the postinst:

+ [ configure = configure ]
+ getent passwd eucalyptus
+ [ -z 2.0+bzr1241-0ubuntu4.1 ]
+ dpkg --compare-versions 2.0+bzr1241-0ubuntu4.1 lt 2.0-0ubuntu1
+ dpkg-statoverride --list /usr/lib/eucalyptus/euca_rootwrap
+ chown root:eucalyptus /usr/lib/eucalyptus/euca_rootwrap
+ chmod 04754 /usr/lib/eucalyptus/euca_rootwrap
+ chown -R eucalyptus:eucalyptus /var/lib/eucalyptus/ /var/log/eucalyptus
+ chmod 700 /var/lib/eucalyptus/keys
+ [ -e /etc/init/eucalyptus.conf ]
+ start eucalyptus
eucalyptus start/running, process 1341
+ [ -e /etc/init/eucalyptus-network.conf ]
+ invoke-rc.d eucalyptus-network start
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service eucalyptus-network start

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start eucalyptus-networ
k
start: Unknown parameter: IFACE
invoke-rc.d: initscript eucalyptus-network, action "start" failed.
+ exit 1