I have followed this [TUTORIAL](http://gazebosim.org/tutorials?tut=ros_installing&cat=connect_ros) to install gazebo_ros_pkgs
I opted to install using the **Pre-Built Debians**
When I try to open the gazebo using
rosrun gazebo_ros gazebo
The gazebo keeps loading and just freezes:

I checked the topic using `rostopic list` and there was no other topics than /rosout and /rosout_agg which are from the ros master that I opened using `roscore`.
*Please help!!!*
I use Ubuntu Xenial, ROS kinetic, gazebo 7. The standalone gazebo , which was installed when I installed the ros, works fine.
I installed the full desktop version of ros.
After installing the gazebo_ros_pkgs, I tried to run the command once again , here's the output:
sudo apt-get install ros-kinetic-gazebo-ros-pkgs ros-kinetic-gazebo-ros-control
[sudo] password for mon:
Reading package lists... Done
Building dependency tree
Reading state information... Done
ros-kinetic-gazebo-ros-control is already the newest version (2.5.13-0xenial-20170805-130400-0800).
ros-kinetic-gazebo-ros-pkgs is already the newest version (2.5.13-0xenial-20170727-212737-0800).
ros-kinetic-gazebo-ros-pkgs set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 89 not upgraded.
I notice that it says: "ros-kinetic-gazebo-ros-pkgs set to manually installed" I wonder if this is the problem????
*EDIT: After reading this [thread](https://askubuntu.com/questions/831/what-does-it-mean-that-a-package-is-set-to-manually-installed) , I realize that 'manually installed' is not the problem.*
I checked on my gazebo_ros_pkgs folder. Here's the output
mon@mon:/opt/ros/kinetic/share/gazebo_ros_pkgs$ ls
package.xml
Please help to solve this.
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