Problemas com gerenciadores e atualizações [de novo]

editado julho 2016 em Sistema
Olá! Boa noite!

Meu nome é César e pela segunda vez estou com um problema no gerenciador de atualizações e no gerenciador de pacote synaptic. Da outra vez, era o flashplugin-nonfree que não permitia abrir nem o gerenciador de aplicativos nem o de pacote synaptic, agora parece que outra coisa que está causando o mesmo problema. Da outra vez, o problema havia sido resolvido numa página em inglês com os seguintes comandos: sudo rm /var/lib/dpkg/info/flashplugin-nonfree.postinst
sudo rm /var/lib/dpkg/info/flashplugin-nonfree.postrm
sudo rm /var/lib/dpkg/info/flashplugin-nonfree.prerm
sudo dpkg --force all --purge flashplugin-nonfree, mas, não dá pra resolver mais com este comando. Se alguém puder ajudar, agradeço. Segue o que aparece quando faço apt-get update:

cesar@cesar-RV411-RV511-E3511-S3511-RV711-E3411 ~ $ sudo apt-get update
[sudo] password for cesar:
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W: Não existem chaves públicas para os seguintes IDs de chaves:
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W: Falhou ao buscar http://debs.unvanquished.net/dists/trusty/main/binary-amd64/Packages 404 Not Found [IP: 107.189.33.26 80]

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W: Falhou ao buscar http://mirror.globo.com/ubuntu/archive/dists/trusty-updates/universe/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.

Já quando tento fazer o upgrade aparece o seguinte:
cesar@cesar-RV411-RV511-E3511-S3511-RV711-E3411 ~ $ sudo apt-get update
[sudo] password for cesar:
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Obter:5 http://mirror.globo.com trusty-updates/multiverse amd64 Packages [13,2 kB]
Atingido http://ppa.launchpad.net trusty InRelease
Obter:6 http://mirror.globo.com trusty-updates/main i386 Packages [837 kB]
Ign http://mint-packages.c3sl.ufpr.br rosa/import Translation-pt_BR
Atingido http://dl.google.com stable/main amd64 Packages
Obter:7 http://mirror.globo.com trusty-updates/restricted i386 Packages [15,6 kB]
Ign http://mint-packages.c3sl.ufpr.br rosa/import Translation-pt
Ign http://mint-packages.c3sl.ufpr.br rosa/import Translation-en
Ign http://mint-packages.c3sl.ufpr.br rosa/main Translation-pt_BR
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Atingido http://dl.google.com stable/main i386 Packages
Ign http://mint-packages.c3sl.ufpr.br rosa/upstream Translation-pt_BR
Obter:8 http://mirror.globo.com trusty-updates/universe i386 Packages [369 kB]
Ign http://mint-packages.c3sl.ufpr.br rosa/upstream Translation-pt
Atingido http://ppa.launchpad.net trusty InRelease
Ign http://mint-packages.c3sl.ufpr.br rosa/upstream Translation-en
Obter:9 http://mirror.globo.com trusty-updates/multiverse i386 Packages [13,6 kB]
Obter:10 http://mirror.globo.com trusty-updates/main Translation-en [421 kB]
Atingido http://archive.canonical.com trusty/partner amd64 Packages
Ign http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://archive.canonical.com trusty/partner i386 Packages
Atingido http://extra.linuxmint.com rosa/main amd64 Packages
Atingido http://repos.sapo.pt beta/sapo amd64 Packages
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://archive.canonical.com trusty/partner Translation-en
Atingido http://repos.sapo.pt beta/sapo i386 Packages
Atingido http://extra.linuxmint.com rosa/main i386 Packages
Ign http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Ign http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Err http://debs.unvanquished.net trusty/main amd64 Packages
404 Not Found [IP: 107.189.33.26 80]
Atingido http://security.ubuntu.com trusty-security/main amd64 Packages
Err http://debs.unvanquished.net trusty/main i386 Packages
404 Not Found [IP: 107.189.33.26 80]
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://security.ubuntu.com trusty-security/restricted amd64 Packages
Atingido http://ppa.launchpad.net trusty InRelease
Ign http://debs.unvanquished.net trusty/main Translation-pt_BR
Atingido http://security.ubuntu.com trusty-security/universe amd64 Packages
Ign http://debs.unvanquished.net trusty/main Translation-pt
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://security.ubuntu.com trusty-security/multiverse amd64 Packages
Ign http://debs.unvanquished.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty InRelease
Ign http://dl.google.com stable/main Translation-pt_BR
Ign http://dl.google.com stable/main Translation-pt
Ign http://extra.linuxmint.com rosa/main Translation-pt_BR
Ign http://dl.google.com stable/main Translation-en
Atingido http://security.ubuntu.com trusty-security/main i386 Packages
Ign http://dl.google.com stable/main Translation-pt_BR
Ign http://dl.google.com stable/main Translation-pt
Ign http://extra.linuxmint.com rosa/main Translation-pt
Atingido http://ppa.launchpad.net trusty InRelease
Ign http://dl.google.com stable/main Translation-en
Atingido http://security.ubuntu.com trusty-security/restricted i386 Packages
Ign http://repos.sapo.pt beta/sapo Translation-pt_BR
Ign http://extra.linuxmint.com rosa/main Translation-en
Obter:11 http://ppa.launchpad.net trusty InRelease [15,5 kB]
Atingido http://security.ubuntu.com trusty-security/universe i386 Packages
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Atingido http://security.ubuntu.com trusty-security/multiverse i386 Packages
Ign http://repos.sapo.pt beta/sapo Translation-en
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://security.ubuntu.com trusty-security/main Translation-en
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://security.ubuntu.com trusty-security/multiverse Translation-en
Atingido http://security.ubuntu.com trusty-security/restricted Translation-en
Ign http://ppa.launchpad.net trusty InRelease
Obter:12 http://mirror.globo.com trusty-updates/multiverse Translation-en [7.227 B]
Obter:13 http://mirror.globo.com trusty-updates/restricted Translation-en [3.699 B]
Obter:14 http://mirror.globo.com trusty-updates/universe Translation-en [193 kB]
Atingido http://security.ubuntu.com trusty-security/universe Translation-en
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Obter:15 http://ppa.launchpad.net trusty InRelease [15,5 kB]
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Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://mirror.globo.com trusty/main amd64 Packages
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Atingido http://mirror.globo.com trusty/multiverse amd64 Packages
Atingido http://mirror.globo.com trusty/main i386 Packages
Atingido http://mirror.globo.com trusty/restricted i386 Packages
Atingido http://mirror.globo.com trusty/universe i386 Packages
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Atingido http://mirror.globo.com trusty/main Translation-pt_BR
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://mirror.globo.com trusty/main Translation-pt
Atingido http://mirror.globo.com trusty/main Translation-en
Atingido http://mirror.globo.com trusty/multiverse Translation-pt_BR
Atingido http://mirror.globo.com trusty/multiverse Translation-pt
Atingido http://mirror.globo.com trusty/multiverse Translation-en
Atingido http://mirror.globo.com trusty/restricted Translation-pt_BR
Atingido http://mirror.globo.com trusty/restricted Translation-pt
Atingido http://mirror.globo.com trusty/restricted Translation-en
Atingido http://mirror.globo.com trusty/universe Translation-pt_BR
Atingido http://mirror.globo.com trusty/universe Translation-pt
Atingido http://mirror.globo.com trusty/universe Translation-en
Ign http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty InRelease
Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty/main Sources
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Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty Release.gpg
Obter:16 http://ppa.launchpad.net trusty/main Sources [17,6 kB]
Obter:17 http://ppa.launchpad.net trusty/main amd64 Packages [20,5 kB]
Obter:18 http://ppa.launchpad.net trusty/main i386 Packages [20,4 kB]
Obter:19 http://ppa.launchpad.net trusty/main Translation-en [10,8 kB]
Atingido http://ppa.launchpad.net trusty Release.gpg
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Atingido http://ppa.launchpad.net trusty Release.gpg
Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty Release
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Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
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Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Translation-en
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Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty Release
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
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Atingido http://ppa.launchpad.net trusty/main Sources
Atingido http://ppa.launchpad.net trusty/main amd64 Packages
Atingido http://ppa.launchpad.net trusty/main i386 Packages
Atingido http://ppa.launchpad.net trusty/main Translation-en
Ign http://ppa.launchpad.net trusty/main Translation-pt_BR
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Baixados 791 kB em 1min 29s (8.817 B/s)
W: Não existem chaves públicas para os seguintes IDs de chaves:
1397BC53640DB551
W: Não existem chaves públicas para os seguintes IDs de chaves:
1397BC53640DB551
W: Erro GPG: http://ppa.launchpad.net trusty InRelease: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 8BE3EAB5EBE14A20
W: Falhou ao buscar http://debs.unvanquished.net/dists/trusty/main/binary-amd64/Packages 404 Not Found [IP: 107.189.33.26 80]

W: Falhou ao buscar http://debs.unvanquished.net/dists/trusty/main/binary-i386/Packages 404 Not Found [IP: 107.189.33.26 80]

W: Falhou ao buscar http://mirror.globo.com/ubuntu/archive/dists/trusty-updates/main/binary-amd64/Packages Hash Sum incorreto

W: Falhou ao buscar http://mirror.globo.com/ubuntu/archive/dists/trusty-updates/universe/binary-amd64/Packages Hash Sum incorreto

W: Falhou ao buscar http://mirror.globo.com/ubuntu/archive/dists/trusty-updates/main/binary-i386/Packages Hash Sum incorreto

W: Falhou ao buscar http://mirror.globo.com/ubuntu/archive/dists/trusty-updates/universe/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.

No gerenciador de atualizações aparece:
Encountered a section with no Package: header,
Problem with MargeList/var/lib/apt/lists/ppa.launch.net_plushuang-tw_ugest-stable_ubuntu_dists_trusty_main_i18n_Translation-en,
The package lists or status file could not be parsed or opened.
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