1.备份
sudo cp /etc/apt/sources.list /etc/apt/sources_origin.list2.修改
sudo gedit /etc/apt/sources.list3.文中全部删除,加入以下内容
(ubuntu18)
(ubuntu20)
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse上面的挺好用,下面这种源也能用,只是会遇到各种各样不兼容问题,因此不建议使用。
deb http://mirrors.aliyun.com/ubuntu/ xenial maindeb-src http://mirrors.aliyun.com/ubuntu/ xenial maindeb http://mirrors.aliyun.com/ubuntu/ xenial-updates maindeb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates maindeb http://mirrors.aliyun.com/ubuntu/ xenial universedeb-src http://mirrors.aliyun.com/ubuntu/ xenial universedeb http://mirrors.aliyun.com/ubuntu/ xenial-updates universedeb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universedeb http://mirrors.aliyun.com/ubuntu/ xenial-security maindeb-src http://mirrors.aliyun.com/ubuntu/ xenial-security maindeb http://mirrors.aliyun.com/ubuntu/ xenial-security universedeb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe4.更新
sudo apt-get update && sudo apt-get upgrade