我正在尝试升级我的版本，即 natty(11.04)。由于不再提供支持，我更改了sources.list，如下所示。
# EOL upgrade sources.list
# Required
deb http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ oneiric main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ oneiric-security main restricted universe multiverse
# Optional
#deb http://archive.ubuntu.com/ubuntu natty main universe restricted multiverse
#deb-src http://archive.ubuntu.com/ubuntu natty main universe restricted multiverse #Added by software-properties
deb http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse
# Optional
#deb http://archive.ubuntu.com/ubuntu natty main universe restricted multiverse
#deb-src http://archive.ubuntu.com/ubuntu natty main universe restricted multiverse #Added by software-properties
deb http://old-releases.ubuntu.com/ubuntu/ oneiric-backports main restricted universe multiverse
我包含了下一个版本 11.10(oneiric) 的存储库。之后我尝试跑步执行发布升级命令。
结果 ：
Error during update
A problem occurred during the update. This is usually some sort of
network problem, please check your network connection and retry.
W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/oneiric/main/binary-i386/Packages
404 Not Found [IP: 91.189.91.13 80]
, E:Some index files failed to download. They have been ignored, or
old ones used instead.
尽管在sources.list中没有提到archive.ubunti.com/...，但我没有收到事件，为什么会引用它？我怎样才能成功升级呢？
答案1
升级的标准流程是 11.04 → 12.04 → 14.04。我的做法是：只升级一次，并且只在迫切需要时才升级。否则：重新安装。
为什么？好吧，因为升级时您将携带旧的垃圾不需要的设置/程序，从而导致系统不稳定，当您最终遇到问题时很难诊断。
最重要的是，当您升级时，您还可以测试/更新服务器的文档！ :-)