W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/quantal/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.149 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
答案1
从此错误消息来看,您似乎没有可用的互联网连接,或者该网站不可用。您应该验证您的互联网连接是否可用,然后重试。
编辑:正如steeldriver在下面的评论中指出的那样,12.10 不再受支持!