debian8 apt:
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
debian 进单用户:
1、在Grub的引导装载程序菜单上，选择你要进入的条目，键入 “e” 来进入编辑模式。
2、在第二行（类似于kernel /vmlinuz-2.6.15 ro root=/dev/hda2 ），键入”e”进入编辑模式；
3、在句末加上”init=/bin/bash”，回车；
4、按“b”启动系统。