如何在ubuntu 14.04上安装无头渲染的Pyrender？

sudo apt-get update
sudo apt-get upgrade

sudo apt-get install -y build-essential cmake git libgl1-mesa-dev libglfw3-dev libegl1-mesa-dev

sudo apt-get install -y python3-pip python3-dev

sudo apt-get install -y libosmesa6-dev

pip3 install PyOpenGL PyOpenGL_accelerate

git clone https://github.com/mmatl/pyrender.git
cd pyrender
pip3 install -r requirements.txt
python3 setup.py install

sudo apt-get install -y xvfb

Xvfb :99 -screen 0 1024x768x24 &
export DISPLAY=:99