yum 坏了，怎么修复？
我在YUM 安装软件的时候，重启了机器。结果在用YUM就不行了。
我下载了YUM 的RPM包重新装了，还是不行。我重装源时：
rpm -ivh http://rpm.livna.org/livna-release-5.rpm
错误哦是：
Retrieving http://rpm.livna.org/livna-release-5.rpm
warning: /var/tmp/rpm-xfer.oSU6WD: Header V3 DSA signature: NOKEY, key ID a109b1ec
error: Failed dependencies:
/bin/bash is needed by livna-release-5-8.noarch
fedora-release >= 5 is needed by livna-release-5-8.noarch
不知道怎么修复啊，谢谢
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