一、为ubuntu20.04更新源
-
给root用户设置密码：命令：
sudo passwd root -
备份原来的源，命令：
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak -
安装vim，命令：
sudo apt install vim -
修改/etc/apt/sources.list文件，命令：
sudo vim /etc/apt/sources.list，将里面的内容全删后，配置为清华源，清华源如下：deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb-src ht