vi /etc/apt/sources.list // 注释掉下面这句话# deb cdrom:[Debian GNU/Linux 9.3.0 _Stretch_ - Official amd64 DVD Binary-1 20171209-12:11]/ stretch contrib main
deb cdrom:[Debian GNU/Linux 9.3.0 _Stretch_ - Official amd64 DVD Binary-1 20171209-12:11]/ stretch contrib main
原文：https://www.cnblogs.com/xiangxinhouse/p/11135903.html
