首先，备份现有源
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak其次，打开源列表
sudo vim /etc/apt/sources.list
sudo gedit /etc/apt/sources.list再次，清除文件内容，添加阿里源，保存文件
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse最后，更新源
sudo apt-get update
sudo apt-get upgrade作者：Chihwei_hsu
来源：http://chihweihsu.com
Github：https://github.com/HsuChihwei