root@controller:/home/administrator# apt-get --force-yes purge nova-novncproxy novnc nova-api nova-ajax-console-proxy nova-cert nova-conductor nova-consoleauth nova-doc nova-scheduler python-novaclient
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package nova-ajax-console-proxy is not installed, so not removed
Package nova-api is not installed, so not removed
Package nova-cert is not installed, so not removed
Package nova-conductor is not installed, so not removed
Package nova-consoleauth is not installed, so not removed
Package nova-doc is not installed, so not removed
Package nova-novncproxy is not installed, so not removed
Package nova-scheduler is not installed, so not removed
Package novnc is not installed, so not removed
Package python-novaclient is not installed, so not removed
The following packages were automatically installed and are no longer required:
  websockify libjs-swfobject
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 101 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up nova-common (1:2014.1-0ubuntu1~cloud0) ...
Command failed, please check log for more info
2014-07-02 13:13:26.717 19837 CRITICAL nova [-] OperationalError: (OperationalError) unable to open database file None None

dpkg: error processing nova-common (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 nova-common
E: Sub-process /usr/bin/dpkg returned an error code (1)