laser_driver stack missing in pr2-desktop install

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It looks like the laser_drivers stack is missing from the pr2-desktop dimaondback install. Is this intentional?

Here is what I did -

$ sudo apt-get install ros-diamondback-pr2-desktop

When I tried to roscd to hokuyo_node, I got an error.

$ roscd hokuyo_node
roscd: No such package 'hokuyo_node'

Installing the laser_drivers stack fixed the problem:

$ sudo apt-get install ros-diamondback-laser-drivers