在11.10机器上的apt-get，我得到：
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/main/source/Sources 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/universe/source/Sources 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/source/Sources 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80] 事实上，security.ubuntu.com包含其他版本，但不包括11.10。 他们发生了什么？
它在一年前已经达到了EOL的地位 ，因此被从主要的软件库中删除。 尽快将系统更新为支持的内容。
除此之外，旧版本的档案可以在这里find。