1、首先安装vim

sudo apt install vim

2、再更改镜像源

sudo vi /etc/apt/sources.list，打开之后，将里边的内容进行删除，更换成下边的内容

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe

3、sudo apt update 进行更新

更新过程中会出现错误

3.1 sudo apt update报错——‘由于没有公钥，无法验证下列签名： NO_PUBKEY 3B4FE6ACC0B21F32’

解决方法：sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32 将后边的3B4FE6ACC0B21F32换成自己出错的地方

3.2 再次进行sudo apt update会出现

W: https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/dists/jammy/InRelease: 密钥存储在过时的 trusted.gpg 密钥环中（/etc/apt/trusted.gpg），请参见 apt-key(8) 的 DEPRECATION 一节以了解详情。这个错误

解决方法：

cd /etc/apt
sudo cp trusted.gpg trusted.gpg.d

最后运行sudo apt-get update就可以了