一、首先更新源为阿里云软件源，增加下载速度

（1）备份当前也就是默认官方的源列表

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

（2）删除sources.list文件中的列表，删除全部内容

sudo gedit /etc/apt/sources.list1

（3）替换内容后，保存

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

4）更新源列表

sudo apt-get update

二、安装Tensorflow（Python3.6.7/CPU）

（1）安装Python3的包管理pip

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sudo apt-get install python3-pip python3-dev

（2）安装tensorflow

（自动安装相关库numpy、tensorboard、six、protobuf、html5lib、bleach、werkzeug、markdown）

（3）测试tensorflow