备份

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

修改源文件

sudo vim /etc/apt/sources.list

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

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

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

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

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

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

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

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

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

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

更新列表

sudo apt-get update

更新软件

sudo apt-get upgrade

补充：vim操作：https://www.runoob.com/linux/linux-vim.html

常见Ubuntu操作命令

sudo apt-get update
sudo apt-get install package 安装包
sudo apt-get remove package 删除包
sudo apt-get search package 搜索包
sudo apt-get show package 获取包相关信息
sudo apt-get install package --reinstall 重新安装包
sudo apt-get -f install 修复安装
sudo apt-get build-dep package 安装相关的编译环境
sudo apt-get upgrade 更新已安装的包
sudo apt-get upgrade 更新已安装的包