最近每次检查更新都失败，然后在终端执行sudo apt-get update命令，失败的有下面那些，如何解决？
错误 http://cn.archive.ubuntu.com utopic/restricted i386 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic/universe i386 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/restricted amd64 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/universe amd64 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/main i386 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/restricted i386 Packages
错误的报头行 [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/main amd64 Packages
404 Not Found [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/multiverse i386 Packages
404 Not Found [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic/main i386 Packages
404 Not Found [IP: 202.118.1.64 80]
错误 http://cn.archive.ubuntu.com utopic-updates/universe i386 Packages
404 Not Found [IP: 202.118.1.64 80]
W: GPG 错误：http://ppa.launchpad.net utopic Release: 由于没有公钥，无法验证下列签名： NO_PUBKEY 2B3F92F902D65EFF
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/multiverse/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/main/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/restricted/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/universe/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/multiverse/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/main/binary-i386/Packages 404 Not Found [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/restricted/binary-i386/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/universe/binary-i386/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic/multiverse/binary-i386/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/multiverse/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/binary-amd64/Packages 404 Not Found [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/binary-amd64/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/binary-amd64/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/main/binary-i386/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/binary-i386/Packages 错误的报头行 [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/binary-i386/Packages 404 Not Found [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 202.118.1.64 80]
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/multiverse/i18n/Translation-en Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/restricted/i18n/Translation-en Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-updates/universe/i18n/Translation-en Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/main/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/restricted/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/source/Sources Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/main/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/restricted/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/multiverse/binary-amd64/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/restricted/binary-i386/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/binary-i386/Packages Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/main/i18n/Translation-en Hash 校验和不符
W: 无法下载 http://cn.archive.ubuntu.com/ubuntu/dists/utopic-backports/universe/i18n/Translation-en Hash 校验和不符
E: Some index files failed to download. They have been ignored, or old ones used instead.