ubuntu系统报错 ImportError: libGL.so.1: cannot open shared object file: No such file or directory解决办法

报错内容：

from .cv2 import * 
ImportError: libGL.so.1: cannot open shared object file:No such file or directory

方法一

运行代码：

sudo apt-get update
sudo apt-get install libgl1-mesa-glx

方法二

报错为import .cv2时出现的

1. 步骤一
   卸载掉原来安装的opencv-python

sudo pip uninstall opencv-python

2. 步骤二

sudo pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-python-headless
sudo pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-contrib-python-headless