Running Gazebo without being superuser

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Hello everyone, I am going to run Gazebo7 on Ubuntu 16.04. I installed it with ros-kinetic-desktop-full. The command 'sudo gazebo' works without problems. The command 'gazebo' returns: gzserver: error while loading shared libraries: libsdformat.so.6: cannot open shared object file: No such file or directory.

Running ldd on gazebo (and on gzserver) I discovered that there is not a dependency on libsdformat.so.6 but only libsdformat.so.4. And I have it. So I really do not understand why he is complaining on libsdformat.so.6.

Moreover, doing:

sudo updatedb
locate libsdformat.so.6

I have no results, while doing locate libsdformat.so.4 it returns the path of the library: /home/tobi/.local/lib/libsdformat.so.4

So, my .bashrc file is:

export LD_LIBRARY_PATH=/home/tobi/.local/lib/local/lib:$LD_LIBRARY_PATH
export PATH=/home/tobi/.local/lib/local/bin:$PATH
export PKG_CONFIG_PATH=/home/tobi/.local/lib/local/lib/pkgconfig:$PKG_CONFIG_PATH
source /home/tobi/.local/share/gazebo/setup.sh

And my setup.sh file is:

export GAZEBO_MASTER_URI=http://localhost:11345
export GAZEBO_MODEL_DATABASE_URI=http://models.gazebosim.org
export GAZEBO_RESOURCE_PATH=/home/tobi/.local/share/gazebo-10:${GAZEBO_RESOURCE_PATH}
export GAZEBO_PLUGIN_PATH=/home/tobi/.local/lib/gazebo-10/plugins:${GAZEBO_PLUGIN_PATH}
export GAZEBO_MODEL_PATH=/home/tobi/.local/share/gazebo-10/models:${GAZEBO_MODEL_PATH}
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/home/tobi/.local/lib/gazebo-10/plugins
export OGRE_RESOURCE_PATH=/usr/lib/x86_64-linux-gnu/OGRE-1.9.0

I have also a folder named gazebo-10 with an identical content. This question and This one did not solve my problem.

Any advice, please? Thanks!