设置更新源
设置Ubuntu Server的更新源
设置更新源
在进行任何更新和软件安装前，建议先设置更新源，以保证速度。
如果服务器在国内，则可以考虑设置apt源为国内代理，这样速度要好很多。
首先备份源列表:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_original
sudo vi /etc/apt/sources.list
然后修改 /etc/apt/sources.list 文件.
ubuntu 23.04
阿里云源 :
deb http://mirrors.aliyun.com/ubuntu/ lunar main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ lunar main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ lunar-security main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ lunar-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ lunar-updates main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ lunar-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ lunar-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ lunar-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ lunar-backports main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ lunar-backports main restricted universe multiverse
中科大源：
deb https://mirrors.ustc.edu.cn/ubuntu/ lunar main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ lunar main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ lunar-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ lunar-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ lunar-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ lunar-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ lunar-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ lunar-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ lunar-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ lunar-proposed main restricted universe multiverse
ubuntu 22.04
阿里云源 (不知道为什么特别慢）:
deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
中科大源（非常快）：
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ jammy-proposed main restricted universe multiverse
ubuntu 20.04
阿里云源:
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
中科大镜像源:
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
对于腾讯云/阿里云上的服务器，默认都配置好了腾讯云和阿里云的源，直接用即可，速度超好。
偶尔会遇到阿里云或者中科大源不可用的情况（以前没遇到过，最近很频繁），可以切换其他源试试。
网易163源：
deb http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ focal main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ focal-security main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ focal-updates main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ focal-backports main restricted universe multiverse
清华源：
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-proposed main restricted universe multiverse
更新系统
先更新各种软件到最新，简单的 apt upgrade 搞定：
sudo apt update
sudo apt upgrade
取消PPA仓库
当添加太多的 PPA 仓库之后，apt update 的速度就会慢很多。
考虑到大多数软件不会经常更新，而且我们也没有立即更新的迫切需求，因此建议取消这些 PPA 仓库。
终端操作
PPA仓库存储位置：
$ cd /etc/apt/sources.list.d
$ ls -l
git-core-ubuntu-ppa-focal.list
打开具体要取消的PPA仓库，如上面的git的ppa仓库文件，注释掉相关的内容。
不要直接删，以后如果需要更新，可以手工取消注释而不用重新找ppa仓库地址再添加。
UI操作
“开始菜单” -> “系统管理” -> “软件源” -> “PPA”, 将不需要及时更新的软件的 PPA 取消。