环境使用18.04 LTS
1、准备工作
设置加速cdn
cd /etc/apt sudo cp sources.list sources.list.bak sudo vim sources.list
删除文件内容再替换为以下内容，vim命令模式 GG dG 可清空
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
sudo apt-get update
2、安装python3.7，现在很简单，直接自动安装。
sudo add-apt-repository ppa:jonathonf/python-3.7
sudo apt-get install python3.7
sudo apt install python3-pip
pip install Cython -i https://pypi.tuna.tsinghua.edu.cn/simple/
安装完发现python版本还是3.6.9，需要执行软链接命令
ln -sf /usr/bin/python3.7 /usr/bin/python
同样，软链接pip命令
ln -sf /usr/bin/pip3 /usr/bin/pip
升级pip
python -m pip install --upgrade pip
3、和之前一样 安装paddlex我这使用清华的加速稳定一些
pip install paddlex -i https://mirror.baidu.com/pypi/simple
目前这个版本基本不会安装成功，需要做下面两步骤
pip install numpy -i https://mirror.baidu.com/pypi/simple
然后再执行下面这个，因为2.0.2无法自动安装，这个我在ubuntu 20.0.4LTS下无法安装成功。
pip install pycocotools==2.0.0
4、然后从新安装paddlex就可以安装成功了
其它参考系列文章1
https://www.cnblogs.com/zhaogaojian/p/14025913.html