虚拟机的Ubuntu下运行一个简单的pybullet例子，报错error: GLSL 3.30 is not supported.

Question

环境：Ubuntu 16.04 Python 3.6.5

运行的例子：

import pybullet as p
import time
import pybullet_data
physicsClient = p.connect(p.GUI)#or p.DIRECT for non-graphical version
p.setAdditionalSearchPath(pybullet_data.getDataPath()) #optionally
p.setGravity(0,0,-10)
planeId = p.loadURDF("plane.urdf")
cubeStartPos = [0,0,1]
cubeStartOrientation = p.getQuaternionFromEuler([0,0,0])
boxId = p.loadURDF("r2d2.urdf",cubeStartPos, cubeStartOrientation)
for i in range (10000):
p.stepSimulation()
time.sleep(1./240.)
cubePos, cubeOrn = p.getBasePositionAndOrientation(boxId)
print(cubePos,cubeOrn)
p.disconnect()

一开始报错是这样的：error: GLSL 1.50 is not supported. Supported versions are: 1.10, 1.20, and 1.00 ES

后面我找到了这一句话：export MESA_GL_VERSION_OVERRIDE=3.3

接着pybullet虽然能打开，但是还是报了错，而且无法运行整个程序

报错的内容：

怎样才能正常运行pybullet