更换源方法
- 修改
/etc/apt/sources.list中的文件
vim /etc/apt/sources.list
#如果提示找不到vim，请安装vim
apt-get install vim
请自行根据源与主机位置远近原则合适的源，复制粘贴到vim进入的sources.list文件中替代之前的源文件。
163源：
deb http://mirrors.163.com/debian/ jessie main non-free contrib
deb http://mirrors.163.com/debian/ jessie-updates main non-free contrib
deb http://mirrors.163.com/debian/ jessie-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib
阿里云源：
# jessie
deb http://mirrors.aliyun.com/debian/ jessie main non-free contrib
deb http://mirrors.aliyun.com/debian/ jessie-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ jessie-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ jessie main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ jessie-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ jessie-backports main non-free contrib
deb http://mirrors.aliyun.com/debian-security/ jessie/updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian-security/ jessie/updates main non-free contrib
台湾源：
# jessie
deb http://ftp.tw.debian.org/debian/ stretch main contrib non-free
deb-src http://ftp.tw.debian.org/debian/ stretch main contrib non-free
香港源：
deb http://ftp.hk.debian.org/debian/ jessie main
deb-src http://ftp.hk.debian.org/debian/ jessie main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
# jessie-updates , previously known as 'volatile'
deb http://ftp.hk.debian.org/debian/ jessie-updates main
deb-src http://ftp.hk.debian.org/debian/ jessie-updates main
替换好sources.list文件内源之后，按ESC，输入:wq，保存之后接着更新
apt-get update
更换好合适的源之后，主机软件安装速度应该会有显著改变。