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Yes, you should be able to remove the debian packages installed by apt for gazebo 2.2 and the corresponding new gazebo_ros_pkgs and install the older ones.

Anything built on top of them will need to be rebuilt.

Your rosdep errors are a separate issue. I would guess that you are not in an environment that as the ROSDISTRO envrionment variable set to hydro so it does not know to look for those packages from hydro. This is usually done by sourcing /opt/ros/hydro/setup/bash source /opt/ros/hydro/setup.bash

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