今天在玩CentOS的时候出现了：
Error: cannot find a valid baseurl for repo: rpmfusion-free
这个问题真到好恶心啊，以前一直使用到是ubuntu，最近切换到CentOS以后，各自小白啊。最后搜索到到答案是：
You seem to have added the RPM Fusion repository incorrectly. Let's start clean. First remove the repo with:
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rpm -e rpmfusion-free-release
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Then re-enable it using:
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rpm -Uvh http:
//download1.rpmfusion.org/free/el/updates/6/i386/rpmfusion-free-release-6-1.noarch.rpm
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