ubuntu 16.04 sudo apt-get upate Error

Reading package lists… Done W: http://cz.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1) E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/by-hash/SHA256/adbec2ad24dc9116db1043190e5146825a235b6841e407e0bea 58b0ee3ee0793 Hash Sum mismatch E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-i386/by-hash/SHA256/78607fb973456f8bae86a69012fee378adc18d988aa1ae38d2b3 16830ece3c6f E: Some index files failed to download. They have been ignored, or old ones used instead. sudo rm -rf /var/lib/apt/lists/* sudo apt clean sudo apt …
ubuntu 16.04 sudo apt-get upate Error 더보기