Package 'ros-indigo-urdfdom-headers' has no installation candidate

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Hi

I'm having trouble installting ros indigo on Ubuntu 14.04. I've followed all of the instructions on this page, but when I run sudo apt-get install ros-indigo-desktop-full I get the following errors:

sudo apt-get install ros-indigo-desktop-full
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:
 ros-indigo-desktop-full : Depends: ros-indigo-desktop but it is not going to be installed
                           Depends: ros-indigo-simulators but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I've narrowed the problem down, it won't install because it can't find the package ros-indigo-urdfdom-headers:

user@computer:/etc/apt$ sudo apt-get install ros-indigo-urdfdom-headers
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ros-indigo-urdfdom-headers is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'ros-indigo-urdfdom-headers' has no installation candidate

Is there a solution to this?

Thanks

Jamie