如题，第一次用这个工具，下载了最新的debian 9，dvd1，其他两个没下载，起来之后安装工具提示:
E: Unable to locate package ....
尝试切换源：（现在的sources.list内容）
# deb cdrom:[Debian GNU/Linux 9.0.0 _Stretch_ - Official i386 DVD Binary-1 20170617-14:24]/ stretch main
#deb cdrom:[Debian GNU/Linux 9.0.0 _Stretch_ - Official i386 DVD Binary-1 20170617-14:24]/ stretch main
deb http://mirrors.163.com/debian/ squeeze main non-free contrib
deb http://mirrors.163.com/debian/ squeeze-proposed-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ squeeze main non-free contrib
deb-src http://mirrors.163.com/debian/ squeeze-proposed-updates main non-free contrib
在执行
apt-get update
提示：
Ign:39 http://mirrors.163.com/debian squeeze-proposed-updates/non-free i386 Packages
Reading package lists... Done
W: The repository 'http://mirrors.163.com/debian squeeze Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://mirrors.163.com/debian squeeze-proposed-updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://mirrors.163.com/debian/dists/squeeze/main/source/Sources 404 Not Found [IP: 123.58.173.186 80]
E: Failed to fetch http://mirrors.163.com/debian/dists/squeeze-proposed-updates/main/source/Sources 404 Not Found [IP: 123.58.173.186 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
也就是现在还是不能用。请知道的指导下新人怎么解决。万分感谢！！！

squeeze已经是老的稳定版了，别随便复制粘贴源，看你用的dvd是Stretch，把squeeze换成stretch再试试看