网络上有一些手册，但都认为debian仍然维护6.0的镜像
然而目前 Debian 存储库并没有受到挤压。
那么，如果镜像不可用，如何将当前服务器更新为可维护的内容呢？
apt-get update
Hit http://security.debian.org squeeze/updates Release.gpg
Ign http://security.debian.org/ squeeze/updates/contrib Translation-en
Ign http://security.debian.org/ squeeze/updates/contrib Translation-en_GB
Ign http://security.debian.org/ squeeze/updates/main Translation-en
Ign http://security.debian.org/ squeeze/updates/main Translation-en_GB
Ign http://security.debian.org/ squeeze/updates/non-free Translation-en
Ign http://security.debian.org/ squeeze/updates/non-free Translation-en_GB
Hit http://security.debian.org squeeze/updates Release
Hit http://security.debian.org squeeze/updates/main Sources
Hit http://security.debian.org squeeze/updates/contrib Sources
Hit http://security.debian.org squeeze/updates/non-free Sources
Hit http://security.debian.org squeeze/updates/main amd64 Packages
Hit http://security.debian.org squeeze/updates/contrib amd64 Packages
Hit http://security.debian.org squeeze/updates/non-free amd64 Packages
Ign http://ftp.us.debian.org squeeze Release.gpg
Ign http://ftp.us.debian.org/debian/ squeeze/contrib Translation-en
Ign http://ftp.us.debian.org/debian/ squeeze/contrib Translation-en_GB
Ign http://ftp.us.debian.org/debian/ squeeze/main Translation-en
Ign http://ftp.us.debian.org/debian/ squeeze/main Translation-en_GB
Ign http://ftp.us.debian.org/debian/ squeeze/non-free Translation-en
Ign http://ftp.us.debian.org/debian/ squeeze/non-free Translation-en_GB
Ign http://ftp.us.debian.org squeeze Release
Ign http://ftp.us.debian.org squeeze/main Sources
Ign http://ftp.us.debian.org squeeze/contrib Sources
Ign http://ftp.us.debian.org squeeze/non-free Sources
Ign http://ftp.us.debian.org squeeze/main amd64 Packages
Ign http://ftp.us.debian.org squeeze/contrib amd64 Packages
Ign http://ftp.us.debian.org squeeze/non-free amd64 Packages
Err http://ftp.us.debian.org squeeze/main Sources
404 Not Found [IP: 128.30.2.26 80]
Err http://ftp.us.debian.org squeeze/contrib Sources
404 Not Found [IP: 128.30.2.26 80]
Err http://ftp.us.debian.org squeeze/non-free Sources
404 Not Found [IP: 128.30.2.26 80]
Err http://ftp.us.debian.org squeeze/main amd64 Packages
404 Not Found [IP: 128.30.2.26 80]
Err http://ftp.us.debian.org squeeze/contrib amd64 Packages
404 Not Found [IP: 128.30.2.26 80]
Err http://ftp.us.debian.org squeeze/non-free amd64 Packages
404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/main/source/Sources.gz 404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/contrib/source/Sources.gz 404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/non-free/source/Sources.gz 404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/main/binary-amd64/Packages.gz 404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/contrib/binary-amd64/Packages.gz 404 Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/non-free/binary-amd64/Packages.gz 404 Not Found [IP: 128.30.2.26 80]
E: Some index files failed to download, they have been ignored, or old ones used instead.
答案1
Debian Squeeze 已达到 EOL，它没有收到任何安全更新，但如果您需要更新数据库并安装软件包，可以在 Debian Archive 上找到其存储库。
sources.list您应该如下编辑：
deb http://archive.debian.org/debian/ squeeze main non-free contrib
您还需要注释掉所有其他存储库。
要更新运行：
apt-get install debian-archive-keyring
apt-get update
随着时间的推移，我们将使旧版本的二进制包过期。目前，我们提供了squeeze、lenny、etch、sarge、woody、potato、slink、hamm 和bo 的二进制文件，并且只有其他版本的源代码。
如果您使用 APT，相关的sources.list 条目如下所示：
deb http://archive.debian.org/debian/ hamm contrib main non-free
或者
deb http://archive.debian.org/debian/ bo bo-unstable contrib main non-free
答案2
你不能。挤压是不再支持。
要接收更新，您必须将 Squeeze 升级到 Wheezy，后者本身仅提供长期支持，然后再升级到当前的稳定版 Jessie。
答案3
即使 Squeeze LTS 现在也不支持，但如果您在支持时保持升级，您应该有一个可以使用标准程序升级到 Wheezy 的系统，但它可能没有经过充分测试。而且 Wheezy 现在只提供长期支持，因此除非您有非常特殊的需求，否则您应该选择 Jessie，它可能会更快、更容易重新安装。