Hi there ,
i have Ubuntu 16.04 running on Vbox. Gazebo 7 is installed already with kinetic and i want to remove it neatly and install 7.4 instead. i have uninstalled gazebo 7 using `sudo apt-get remove gazebo7` and followed the tutorial
[link text](http://gazebosim.org/tutorials?cat=install&tut=install_ubuntu&ver=7.0). however, many things didnt work afterwards even after re-installing them such as ARdrone_anatomy and tum_simulator so i guess i didnt do it the right way
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