Ubuntu20.04更换国内源

1、备份原来的源

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak20220906

2、编辑sources.list配置文件更换源

sudo vim/etc/apt/sources.list

添加如下内容

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

3、更新源

sudo apt-get update

4、更新软件

sudo apt-get upgrade

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最后装个MySQL测试一下
# apt install mysql-server

可以看到已经成功安装上了MySQL80
root@jiahao:/# mysql --version
mysql  Ver 8.0.30-0ubuntu0.20.04.2 for Linux on x86_64 ((Ubuntu))
root@jiahao:/# dpkg -l | grep mysql
ii  mysql-client-8.0                      8.0.30-0ubuntu0.20.04.2            amd64        MySQL database client binaries
ii  mysql-client-core-8.0                 8.0.30-0ubuntu0.20.04.2            amd64        MySQL database core client binaries
ii  mysql-common                          5.8+1.0.5ubuntu2                   all          MySQL database common files, e.g. /etc/mysql/my.cnf
ii  mysql-server                          8.0.30-0ubuntu0.20.04.2            all          MySQL database server (metapackage depending on the latest version)
ii  mysql-server-8.0                      8.0.30-0ubuntu0.20.04.2            amd64        MySQL database server binaries and system database setup
ii  mysql-server-core-8.0                 8.0.30-0ubuntu0.20.04.2            amd64        MySQL database server binaries