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 ** Also affects: eucalyptus (Ubuntu Natty) Importance: High Status: Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/726769 Title: package eucalyptus-common 2.0.1 bzr1255-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs