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Just as @Raskkii‘ｓanswer, we should not overwrite the default path, but still I try thoes following to get it done:

try:

whereis gazebo

then you will get one is in /usr/share/gazebo

gedit /usr/share/gazebo/setup.sh

copy those environment variable you need, such as

export GAZEBO_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/gazebo-7/plugins:${GAZEBO_PLUGIN_PATH}
export GAZEBO_MODEL_PATH=/usr/share/gazebo-7/models:${GAZEBO_MODEL_PATH}

and then add some path way you want to add in ~/.bashrc, separate with : , such as

export GAZEBO_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/gazebo-7/plugins:${GAZEBO_PLUGIN_PATH}:/home/ljx/gazebo_plugin_tutorial/build
export GAZEBO_MODEL_PATH=/usr/share/gazebo-7/models:${GAZEBO_MODEL_PATH}:/home/ljx/gazebo_plugin_tutorial/models