Ubuntu Server 18.04 切换软件源到国内镜像
[*] Ubuntu 源列表
【中科大】
1、repository file generator
2、具体命令：
wget https://mirrors.ustc.edu.cn/repogen/conf/ubuntu-http-4-bionic -O sources.list
# or https
wget https://mirrors.ustc.edu.cn/repogen/conf/ubuntu-https-4-bionic -O sources.list
sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
sudo mv sources.list /etc/apt/sources.list
sudo apt update【阿里云】
编辑文件 /etc/apt/sources.list ：
deb https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
## Not recommended
# deb https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse 【sources.list 内容说明】
[*] 关于组件：apt 背后的故事
main： 免费，Ubuntu 官方维护的自由软件
restricted： 不免费，但是正规支持的，一般是设备专有驱动
universe：免费，社区维护的自由软件
multiverse：不免费，无正规支持，非自由软件
[*] 关于更新：UbuntuUpdates
security：重要的安全更新
updates：非安全性更新，即不影响到系统安全的 bug 修补。
proposed：预更新，小 beta 版，过后会进入或。
backports：新软件的反向导出，新软件为老系统编译的版本。 *** walker ***
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