忽略 http://mirrors.163.com utopic InRelease
忽略 http://mirrors.163.com utopic-updates InRelease
忽略 http://mirrors.163.com utopic-backports InRelease
忽略 http://mirrors.163.com utopic-security InRelease
404 Not Found [IP: 123.58.173.186 80]
404 Not Found [IP: 123.58.173.186 80]
错误 http://mirrors.163.com utopic-security/restricted i386 Packages
404 Not Found [IP: 123.58.173.186 80]
错误 http://mirrors.163.com utopic-security/universe i386 Packages
404 Not Found [IP: 123.58.173.186 80]
错误 http://mirrors.163.com utopic-security/multiverse i386 Packages
404 Not Found [IP: 123.58.173.186 80]
忽略 http://mirrors.163.com utopic-security/main Translation-zh_CN
忽略 http://mirrors.163.com utopic-security/multiverse Translation-zh_CN
忽略 http://mirrors.163.com utopic-security/multiverse Translation-zh
忽略 http://mirrors.163.com utopic-security/restricted Translation-en
W: 无法下载 http://mirrors.163.com/ubuntu/dists/utopic/restricted/binary-i386/Packages 404 Not Found [IP: 123.58.173.186 80]
W: 无法下载 http://mirrors.163.com/ubuntu/dists/utopic/universe/binary-i386/Packages 404 Not Found [IP: 123.58.173.186 80]
W: 无法下载 http://mirrors.163.com/ubuntu/dists/utopic/multiverse/binary-i386/Packages 404 Not Found [IP: 123.58.173.186 80]
W: 无法下载 http://mirrors.163.com/ubuntu/dists/utopic-updates/universe/source/Sources 404 Not Found [IP: 123.58.173.186 80]
E: Some index files Failed to download. They have been ignored,or old ones used instead.qu@qu-All-Series:~$
我下载的是ubuntu12.10版本，而这个版本提供的源无法下载东西。所以我建议大家以后下载ubuntu14.04 或者ubuntu 16.04这种.04的版本，不会出现无法下载的情况。
原文链接：https://www.f2er.com/ubuntu/355840.html