你们的源挂了，debian更新失败，sources.list也无法修改！
apt-get update
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/main/source/Sources 404 Not Found
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/contrib/source/Sources 404 Not Found
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/non-free/source/Sources 404 Not Found
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/contrib/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://mirrors.cloud.aliyuncs.com/debian/dists/wheezy/updates/non-free/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
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