Looks like bad configuration file:
Configuration file '/etc/nova/nova.conf'
== Modified (by you or by a script) since installation.
== Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1384715
Title:
package nova-common 1:2014.1.3-0ubuntu1 failed to install/upgrade:
subprocess
