Eu verifiquei e apliquei todas as soluções fornecidas nesses links Problemas ao baixar a lista de pacotes devido a um "Hash sum erro de correspondência " sudo apt-get update falha devido a incompatibilidade de Hash Sum
mas meu problema não está resolvido Estou recebendo esses erros
Fetched 35.1 MB in 1min 16s (458 kB/s)
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/source/Sources Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/source/Sources Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/source/Sources Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-i386/Packages Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages Hash Sum mismatch
W: Failed to fetch http://pk.archive.ubuntu.com/ubuntu/dists/trusty-updates/multiverse/binary-i386/Packages Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.