pete@probox2:~/src/location-service/trunk$ sudo apt-get install ubuntu-desktop-next
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 ubuntu-desktop-next : Depends: packagekit
E: Unable to correct problems, you have held broken packages.
pete@probox2:~/src/location-service/trunk$ sudo apt-get build-dep unity8
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed
  android-headers doxyqml libavahi-client-dev libavahi-common-dev libconnectivity-qt1-dev libhardware-dev libpam0g-dev libpay2-dev
  libpulse-dev libqt5xmlpatterns5-dev libsystemsettings-dev libusermetricsoutput1-dev python-setuptools python3-all
  qml-module-qttest qtbase5-private-dev qtdeclarative5-private-dev qtdeclarative5-qtmultimedia-plugin
0 to upgrade, 18 to newly install, 0 to remove and 1 not to upgrade.
Need to get 1,845 kB of archives.
After this operation, 13.6 MB of additional disk space will be used.
Do you want to continue? [Y/n]