oot@roto-virtual-machine:/etc/apt# apt-get install redis-server

Reading package lists... Done

Building dependency tree

Reading state information... Done

You might want to run 'apt-get -f install' to correct these:

The following packages have unmet dependencies:

nova-volume : Depends: nova-common (= 2012.1.3+stable-20120827-4d2a4afe-0ubuntu1.4) but 2012.1.3+stable-20130423-e52e6912-0ubuntu1.1 is to be installed

E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

解决办法：

root@roto-virtual-machine:/etc/apt# dpkg --purge nova-volume