修改/etc/apt/sources.list

# https://wiki.debian.org/LTS/Using
deb http://deb.debian.org/debian/ jessie main contrib non-free
deb-src http://deb.debian.org/debian/ jessie main contrib non-free
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
来源：http://bbsah.com/thread-63905.htm