Ming Lei, that is an issue with the ubuntu packaging of nova not of nova itself. it looks like you are having a dependency issue with WebOb.
** Changed in: nova Status: New => Invalid -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1260432 Title: nova-compute can't be setting up during install on trusty Status in OpenStack Compute (Nova): Invalid Bug description: 1, during install: Setting up nova-compute (1:2014.1~b1-0ubuntu2) ... start: Job failed to start invoke-rc.d: initscript nova-compute, action "start" failed. dpkg: error processing nova-compute (--configure): subprocess installed post-installation script returned error exit status 1 Setting up nova-compute-kvm (1:2014.1~b1-0ubuntu2) ... Errors were encountered while processing: nova-compute E: Sub-process /usr/bin/dpkg returned an error code (1) 2, the system is latest trusty: ming@arm64:~$ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: dnsmasq-utils iputils-arping libboost-system1.53.0 libboost-thread1.53.0 libclass-isa-perl libopts25 libswitch-perl ttf-dejavu-core Use 'apt-get autoremove' to remove them. The following packages have been kept back: checkbox-cli 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 3, looks /usr/bin/nova-compute can't be started: ming@arm64:~$ nova-compute 2013-12-12 17:57:19.992 13823 ERROR stevedore.extension [-] Could not load 'file': (WebOb 1.3 (/usr/lib/python2.7/dist-packages), Requirement.parse('WebOb>=1.2.3,<1.3')) 2013-12-12 17:57:19.993 13823 ERROR stevedore.extension [-] (WebOb 1.3 (/usr/lib/python2.7/dist-packages), Requirement.parse('WebOb>=1.2.3,<1.3')) 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension Traceback (most recent call last): 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 134, in _load_plugins 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension invoke_kwds, 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 146, in _load_one_plugin 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension plugin = ep.load() 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2107, in load 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension if require: self.require(env, installer) 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2120, in require 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension working_set.resolve(self.dist.requires(self.extras),env,installer))) 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 580, in resolve 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension raise VersionConflict(dist,req) # XXX put more info here 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension VersionConflict: (WebOb 1.3 (/usr/lib/python2.7/dist-packages), Requirement.parse('WebOb>=1.2.3,<1.3')) 2013-12-12 17:57:19.993 13823 TRACE stevedore.extension 2013-12-12 17:57:20.133 13823 ERROR nova.virt.driver [-] Compute driver option required, but not specified To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1260432/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp