I got following error while apt-get update
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/by-hash/SHA256/fb4097adcf683477b8870a1e205779221cb204fbe03919ce887c21797c9c800d Hash Sum mismatch
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-i386/by-hash/SHA256/c527e281bab37365996fe61f485bf4c24687700408e5b8c926cfe11878a70b12
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/binary-i386/by-hash/SHA256/5b256f30702a00d8b04f3bd91129b6ebd584639eb7e3577bcb98444574de514f
E: Some index files failed to download. They have been ignored, or old ones used instead.
Suggest me How to fix this.