Ubuntu20更换阿里源

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

sudo vim  /etc/apt/sources.list

//配置内容如下

deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse 

deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse 

deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse 

deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse 

deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse 

deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse 

deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse focal

sudo apt-get update

sudo apt-get upgrade