Ubuntu本身的源使用的是国内的源，下载速度比较慢，不像CentOS一样yum安装的时候对镜像站点进项选择，

所以选择了更换成国内的源。

以下内容整合自网络

备份/etc/apt/sources.list文件

mv /etc/apt/sources.list /etc/apt/sourses.list.backup

新建/etc/apt/sources.list文件并添加以下内容

#163源

deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse

deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse

deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse

deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse

deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

更改完成之后执行以下命令

# apt update

# apt upgrade

其他的一些apt命令

sudo apt-get update 更新源

sudo apt-get install package 安装包

sudo apt-get remove package 删除包

sudo apt-cache search package 搜索软件包

sudo apt-cache show package 获取包的相关信息，如说明、大小、版本等

sudo apt-get install package --reinstall 重新安装包

sudo apt-get -f install 修复安装

sudo apt-get remove package --purge 删除包，包括配置文件等

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 dist-upgrade 升级系统

sudo apt-cache depends package 了解使用该包依赖那些包

sudo apt-cache rdepends package 查看该包被哪些包依赖

sudo apt-get source package 下载该包的源代码

sudo apt-get clean && sudo apt-get autoclean 清理无用的包

sudo apt-get check 检查是否有损坏的依赖