安装Ubuntu后，使用海外源代码太晚了。 把dydhf作为国内来源会快很多。
1、dydhf进程1.1备份/etc/apt/sources.list，命令如下：
sudo CP/etc/apt/sources.list/etc/apt/apt/sources/apt/sources.list.bak 1.2 dydhfubuntu的源列表dydhf/etc/apt/apt/soububuntu
1.2.1官方中国Ubuntu 20.04更新来源deb http://cn.archive.Ubuntu.com/Ubuntu/focalmainrestricteduniversemultiversedeb 3358 cn.archiversedeb 3358 cn.archiverse focal-securitymainrestricteduniversemultiveb om/Ubuntu/focal-updatesmainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/focal-proposedmainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/focal-backportsmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/focalmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/focal-securitymainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/focal-updatesmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/focal-proposedmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/focal-backportsmainrestricteduniversemultiverse 1.2.2官方中国Ubuntu 18.04更新来源deb http://cn.archive.Ubuntu.com/Ubuntu/bionicmainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/bionic-securitymainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/bionic-updatesmainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/bionic-proposedmainrestricteduniversemultiversedeb http://cn.archive.Ubuntu.com/Ubuntu/bionic-backportsmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/bionicmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/bionic-securitymainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/bionic-updatesmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/bionic-proposedmainrestricteduniversemultiversedeb-src http://cn.archive.Ubuntu.com/Ubuntu/bionic-backportsmainrestricteduniversemultiverse 1.2.3官方中国Ubuntu 16.04更新来源deb http://cn.archive.Ubuntu.com/Ubuntu/xenial
u/ xenial-security main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiversedeb http://cn.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse##测试版源deb http://cn.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse# 源码deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiversedeb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse##测试版源deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse# Canonical 合作伙伴和附加deb http://archive.canonical.com/ubuntu/ xenial partnerdeb http://extras.ubuntu.com/ubuntu/ xenial main 1.3 最后执行更新源命令更新源命令如下：
sudo apt-get updatesudo apt-get upgrade 2、国内比较有名的Ubuntu镜像网站可将官方中国 http://cn.archive.ubuntu.com/ubuntu/ 替换为下面任意的服务器：
阿里云http://mirrors.aliyun.com/ubuntu/
Ubuntu 20.04 更新源如下：
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverseUbuntu 18.04 更新源如下：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse 网易http://mirrors.163.com/ubuntu/
Ubuntu 20.04 更新源如下：
deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverseUbuntu 18.04 更新源如下：
deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse 搜狐http://mirrors.sohu.com/ubuntu/
教育网
中科大
https://mirrors.ustc.edu.cn/ubuntu/ (v4/v6)
http://mirrors4.ustc.edu.cn/ubuntu/ (v4)
http://mirrors6.ustc.edu.cn/ubuntu/ (v6)
中科院 OpenCAS
http://mirrors.opencas.cn/ubuntu/
清华
http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ (v4/v6) http://mirrors.4.tuna.tsinghua.edu.cn/ubuntu/ (v4) http://mirrors.6.tuna.tsinghua.edu.cn/ubuntu/ (v6)
上海交通大学
http://ftp.sjtu.edu.cn/ubuntu/ (v4/v6)
http://ftp6.sjtu.edu.cn/ubuntu/ (v6)
Ubuntu 16.04 source
http://wiki.ubuntu.org.cn/%E6%A8%A1%E6%9D%BF:16.04source
Ubuntu 18.04dydhf默认源为国内源
https://www.linuxidc.com/Linux/2018-08/153709.htm
阿里云Ubuntu 镜像
https://developer.aliyun.com/mirror/ubuntu