如何解决这个 yum 问题:“没有 repomd 文件”

如何解决这个 yum 问题:“没有 repomd 文件”

我正在使用 Fedora 20 并尝试安装几个软件包。例如

sudo yum install python-matplotlib

并得到这个回应每一个我尝试的包:

Loaded plugins: langpacks, refresh-packagekit
adobe-linux-i386                                         |  951 B  00:00     
epel/i386/metalink                                       |  38 kB  00:00     
Could not parse metalink https://mirrors.fedoraproject.org/metalink repo=epel-7&arch=i386 error was 
No repomd file


One of the configured repositories failed (Unknown),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Disable the repository, so yum won't use it by default. Yum will then
        just ignore the repository until you permanently enable it again or use
        --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>

     4. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

File /var/cache/yum/i386/20/epel/metalink.xml does not exist

我对这些建议的理解还不足以自信地尝试它们。

我已经在互联网上搜索了解决方案并尝试了这个......

sudo yum clean all
sudo yum update -y

...这对问题没有影响。

和这个 ...

[Harry@localhost]~% cat /etc/fedora-release
Fedora release 20 (Heisenbug)
[Harry@localhost]~% sudo yum distro-sync --releasever=20

...这给出了相同的“没有 repomd 文件”错误

请问有人可以帮我解决这个问题吗?

答案1

Fedora 20 被认为是旧的、不受支持的。根据费多拉维基,这也适用于 Fedora 21。

时间线的解释如下维基百科的另一部分:

Fedora 项目大约每 6 个月发布一个新版本的 Fedora,并为这些版本提供大约 13 个月的更新包(维护)。这允许用户“跳过版本”,同时仍然能够始终拥有仍在接收更新的系统。

Fedora 20 于 2013 年底发布;这是 2016 年中期。如果您想要更新,则必须升级系统。

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