Centos、Ubuntu、Debian、Fedora、OpenSUSE、FreeBSD系統換軟件源
Linux系統安裝完後軟件源一般都是國外服務器，在國內特別慢，這時候就需要更換國內的鏡像源。
高性價比和便宜的VPS/雲服務器推薦：https://blog.zeruns.tech/archives/383.html
Centos
1、備份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、更換源
下載新的CentOS-Base.repo到/etc/yum.repos.d/
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
注意http://mirrors.aliyun.com/repo/Centos-7.repo中的7改爲自己的Centos版本號，比如Centos 8就是http://mirrors.aliyun.com/repo/Centos-8.repo。
3、運行yum makecache生成緩存
yum makecache
Ubuntu
1.備份
sudo cp /etc/apt/sources.list /etc/apt/sources_init.list
將以前的源備份一下，以防以後可以用的。
2.更改文件權限使其可編輯
sudo chmod 777 /etc/apt/source.list
3.更換源
sudo nano /etc/apt/sources.list
使用nano打開文本，刪除原來文件裏的內容，將下面其中一個源複製進去，然後保存。
阿里源：
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
清華源：
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
3.更新
更新源
sudo apt-get update
修復損壞的軟件包，嘗試卸載出錯的包，重新安裝正確版本的。
sudo apt-get -f install
更新軟件
sudo apt-get upgrade
Debian
1.備份
sudo cp /etc/apt/sources.list /etc/apt/sources.list_bak
2.更換源
一般情況下，將/etc/apt/sources.list文件中 Debian 默認的源地址http://deb.debian.org替換爲http://mirrors.ustc.edu.cn（清華源）即可。
sudo sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list
也可以直接編輯/etc/apt/sources.list文件（v）
sudo vi /etc/apt/sources.list
加入如下內容即可
deb http://mirrors.ustc.edu.cn/debian stable main contrib non-free
# deb-src http://mirrors.ustc.edu.cn/debian stable main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free
# deb-src http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free
# deb http://mirrors.ustc.edu.cn/debian stable-proposed-updates main contrib non-free
# deb-src http://mirrors.ustc.edu.cn/debian stable-proposed-updates main contrib non-free
敲擊i鍵進入插入模式，組合鍵ctrl+shift+v將複製內容粘貼至源文件中，敲擊esc鍵進入命令模式，輸入:wq!保存並退出。
其他鏡像源：
阿里雲：http://mirrors.aliyun.com/
搜狐：http://mirrors.sohu.com/
網易：http://mirrors.163.com/
3.更新
sudo apt-get update
Fedora
su
cd /etc/yum.repos.d/
mv fedora.repo fedora.repo.backup
mv fedora-updates.repo fedora-updates.repo.backup
wget -O /etc/yum.repos.d/fedora.repo http://mirrors.aliyun.com/repo/fedora.repo
wget -O /etc/yum.repos.d/fedora-updates.repo http://mirrors.aliyun.com/repo/fedora-updates.repo
dnf clean all
dnf makecache
OpenSUSE
1.禁用原有軟件源
sudo zypper mr -da
2.添加科大鏡像源
sudo zypper ar -fc https://mirrors.ustc.edu.cn/opensuse/distribution/leap/42.1/repo/oss USTC:42.1:OSS
sudo zypper ar -fc https://mirrors.ustc.edu.cn/opensuse/distribution/leap/42.1/repo/non-oss USTC:42.1:NON-OSS
sudo zypper ar -fc https://mirrors.ustc.edu.cn/opensuse/update/leap/42.1/oss USTC:42.1:UPDATE-OSS
sudo zypper ar -fc https://mirrors.ustc.edu.cn/opensuse/update/leap/42.1/non-oss USTC:42.1:UPDATE-NON-OSS
3.手動刷新軟件源
sudo zypper ref
4.更新系統
sudo zypper up
FreeBSD
1.修改 pkg 源
mkdir -p /usr/local/etc/pkg/repos
vim /usr/local/etc/pkg/repos/FreeBSD.conf
# content of FreeBSD.conf
FreeBSD: {
url: "pkg+http://mirrors.ustc.edu.cn/freebsd-pkg/${ABI}/quarterly",
}
2.修改 ports 源
vim /etc/make.conf
# content of make.conf
FETCH_CMD=axel -n 10 -a
DISABLE_SIZE=yes
MASTER_SITE_OVERRIDE?=http://mirrors.ustc.edu.cn/freebsd-ports/distfiles/${DIST_SUBDIR}/
3.修改 portsnap 源
vim /etc/portsnap.conf
# content of porsnap.conf
SERVERNAME=porsnap.tw.freebsd.org
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