sobre o apt do trusty(14.04)

[matusalenmts]

galera eu baixei e estou utilizando o ubuntu 14.04 mas continua com um erro muito dificil arrumar o apt-get update eu sempre ponho esse comando e dão esse erros

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W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 4874D3686E80C6B7
W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY F1773AF13B1510FD
W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY EF4186FE247510BE
W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY C2518248EEA14886
W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 6AF0E1940624A220
W: Erro GPG: http://ppa.launchpad.net trusty Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 5A9A06AEF9CB8DB0
W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_trusty_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_restricted_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_universe_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_multiverse_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_restricted_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_universe_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_multiverse_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_restricted_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_universe_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty_multiverse_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_main_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_restricted_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_universe_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_multiverse_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_universe_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_multiverse_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_universe_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-security_multiverse_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_restricted_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_universe_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_multiverse_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_restricted_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_universe_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_multiverse_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_restricted_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_universe_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-updates_multiverse_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_main_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_restricted_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_universe_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_multiverse_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_restricted_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_universe_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_multiverse_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_restricted_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_universe_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-proposed_multiverse_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_main_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_restricted_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_universe_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_multiverse_source_Sources  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_main_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_restricted_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_universe_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_multiverse_binary-amd64_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_main_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_restricted_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_universe_binary-i386_Packages  Hash Sum incorreto

W: Falhou ao buscar bzip2:/var/lib/apt/lists/partial/55.archive.ubuntu.com_ubuntu_dists_trusty-backports_multiverse_binary-i386_Packages  Hash Sum incorreto

E: Falhou o download de alguns ficheiros de índice. Foram ignorados ou os antigos foram usados em seu lugar.
como arrumar isso ta me dando muita dor de cabeça por favor

[Cleiton Nunes]

http://www.vivaolinux.com.br/topico/UbuntuBR/Hash-Sum-incorreto
Abra a central de programas e vá no menu 'editar' > 'canais de software' e mude o mirror dos repositórios para "servidor principal", rode um sudo apt-get update no terminal,  tente novamente e veja se deu certo.
.
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sobre o erro da chave pública:
http://ubuntuforum-br.org/index.php/topic,114680.0.html