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I ran into the same issue attempting to install ros-indigo-gazebo-ros: I'd previously been working through the Gazebo tutorials and had installed Gazebo 4, per the instructions. Then came to realize that Indigo needs Gazebo 2, as explained here. As a previous post mentioned, you need to remove Gazebo 4 and install Gazebo 2:

sudo apt-get remove gazebo4
sudo apt-get install libsdformat1
sudo apt-get install gazebo2

Not sure if the second step was actually necessary; I was just chasing the dependency warnings. Hope that helps.

Rick