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/up…