Comment 2 for bug 872756

I can confirm this:

christopher@Xyz:~$ sudo apt-get install labyrinth
[sudo] password for christopher:
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:
 labyrinth : Depends: python-numeric but it is not installable
E: Unable to correct problems, you have held broken packages.

...similarly, this package shows up int the Software Center but is not installable from there, either.