Open Stack

I'm just about ready to upgrade to Liberty.  I've started a dry run by 
setting up a trusty machine with the ubuntu kilo cloud archive in my 
sources.list.d, and installed nova-compute, version 
2015.1.2-0ubuntu2~cloud0.

Next I moved my cloud-archive reference to liberty, and ran 'apt-get 
install nova-compute' and now I'm feeling like a college student who 
skipped one too many classes because the version numbers in liberty are 
totally different and apt's dependency graph is broken all the way down. 
  So, I tried a full-blown 'apt-get dist-upgrade' and apt's default 
behavior was to uninstall nova, so I guess apt has been skipping class too.

I'm missing something obvious, right?  Surely there's an upgrade path 
around here someplace, and the cloud archive isn't a purely symbolic 
exercise?

Thanks in advance -- sorry I'm a little ranty, it's past my bedtime :)

-Andrew