Já estava instalado, só que na ultima atualização, o sistema não reconheceu uma atualização para o flash, também o sistema diz que já esta instalado.
olha aqui o resultado do que tu falou para fazer:
elifaz@PC1-MS-7788:~$ sudo apt-get update && sudo apt-get install ubuntu-restricted-extras
[sudo] password for elifaz:
Ign
http://security.ubuntu.com saucy-security InRelease
Obter:1
http://security.ubuntu.com saucy-security Release.gpg [933 B]
Obter:2
http://security.ubuntu.com saucy-security Release [49,6 kB]
Obter:3
http://security.ubuntu.com saucy-security/main Sources [38,6 kB]
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http://security.ubuntu.com saucy-security/restricted Sources [14 B]
Obter:5
http://security.ubuntu.com saucy-security/universe Sources [8.397 B]
Obter:6
http://security.ubuntu.com saucy-security/multiverse Sources [692 B]
Obter:7
http://security.ubuntu.com saucy-security/main amd64 Packages [106 kB]
Obter:8
http://security.ubuntu.com saucy-security/restricted amd64 Packages [14 B]
Obter:9
http://security.ubuntu.com saucy-security/universe amd64 Packages [36,3 kB]
Obter:10
http://security.ubuntu.com saucy-security/multiverse amd64 Packages [1.160 B]
Obter:11
http://security.ubuntu.com saucy-security/main i386 Packages [105 kB]
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http://ppa.launchpad.net saucy InRelease
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http://ppa.launchpad.net saucy InRelease
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http://ppa.launchpad.net saucy InRelease
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http://security.ubuntu.com saucy-security/restricted i386 Packages [14 B]
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http://ppa.launchpad.net saucy InRelease
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http://security.ubuntu.com saucy-security/universe i386 Packages [36,6 kB]
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http://ppa.launchpad.net saucy InRelease
Obter:14
http://security.ubuntu.com saucy-security/multiverse i386 Packages [1.395 B]
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http://ppa.launchpad.net saucy InRelease
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http://ppa.launchpad.net saucy InRelease
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http://ppa.launchpad.net saucy Release.gpg
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http://ppa.launchpad.net saucy Release.gpg
Obter:15
http://ppa.launchpad.net saucy Release.gpg [316 B]
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http://ppa.launchpad.net saucy Release.gpg
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http://security.ubuntu.com saucy-security/main Translation-en [57,8 kB]
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http://ppa.launchpad.net saucy Release.gpg
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http://ppa.launchpad.net saucy Release.gpg
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http://ppa.launchpad.net saucy Release.gpg
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http://ppa.launchpad.net saucy Release
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http://ppa.launchpad.net saucy Release
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http://security.ubuntu.com saucy-security/multiverse Translation-en
Obter:17
http://ppa.launchpad.net saucy Release [11,9 kB]
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http://ppa.launchpad.net saucy Release
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http://ppa.launchpad.net saucy Release
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http://security.ubuntu.com saucy-security/restricted Translation-en
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http://ppa.launchpad.net saucy Release
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http://ppa.launchpad.net saucy Release
Obter:18
http://security.ubuntu.com saucy-security/universe Translation-en [21,2 kB]
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http://ppa.launchpad.net saucy/main amd64 Packages
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http://ppa.launchpad.net saucy/main i386 Packages
Obter:19
http://ppa.launchpad.net saucy/main amd64 Packages [20,5 kB]
Obter:20
http://ppa.launchpad.net saucy/main i386 Packages [20,5 kB]
Atingido
http://ppa.launchpad.net saucy/main amd64 Packages
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http://ppa.launchpad.net saucy/main i386 Packages
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https://download.01.org saucy InRelease
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http://ppa.launchpad.net saucy/main amd64 Packages
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http://ppa.launchpad.net saucy/main i386 Packages
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http://ppa.launchpad.net saucy/main amd64 Packages
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http://ppa.launchpad.net saucy/main i386 Packages
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http://security.ubuntu.com saucy-security/main Translation-pt_BR
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http://security.ubuntu.com saucy-security/main Translation-pt
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http://security.ubuntu.com saucy-security/main Translation-pt_PT
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http://security.ubuntu.com saucy-security/multiverse Translation-pt_BR
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http://security.ubuntu.com saucy-security/multiverse Translation-pt
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http://security.ubuntu.com saucy-security/restricted Translation-pt_BR
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http://security.ubuntu.com saucy-security/restricted Translation-pt
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http://security.ubuntu.com saucy-security/restricted Translation-pt_PT
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http://security.ubuntu.com saucy-security/universe Translation-pt_BR
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http://security.ubuntu.com saucy-security/universe Translation-pt
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http://security.ubuntu.com saucy-security/universe Translation-pt_PT
Err
http://br.archive.ubuntu.com saucy InRelease
Err
http://br.archive.ubuntu.com saucy-updates InRelease
Err
http://br.archive.ubuntu.com saucy-backports InRelease
Err
http://br.archive.ubuntu.com saucy Release.gpg
Não foi possível resolver 'br.archive.ubuntu.com'
Err
http://br.archive.ubuntu.com saucy-updates Release.gpg
Não foi possível resolver 'br.archive.ubuntu.com'
Err
http://br.archive.ubuntu.com saucy-backports Release.gpg
Não foi possível resolver 'br.archive.ubuntu.com'
Err
http://extras.ubuntu.com saucy InRelease
Err
http://extras.ubuntu.com saucy Release.gpg
Não foi possível resolver 'extras.ubuntu.com'
Ign
https://download.01.org saucy Release.gpg
Atingido
https://download.01.org saucy Release
Obter:21
https://download.01.org saucy/main amd64 Packages/DiffIndex [1.013 B]
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https://download.01.org saucy/main amd64 Packages/DiffIndex
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https://download.01.org saucy/main i386 Packages/DiffIndex
Err
http://ppa.launchpad.net saucy/main amd64 Packages
404 Not Found
Err
http://ppa.launchpad.net saucy/main i386 Packages
404 Not Found
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http://ppa.launchpad.net saucy/main Translation-pt_BR
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http://ppa.launchpad.net saucy/main Translation-pt
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http://ppa.launchpad.net saucy/main Translation-pt_PT
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http://ppa.launchpad.net saucy/main Translation-en
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http://ppa.launchpad.net saucy/main Translation-en
Err
http://ppa.launchpad.net saucy/main amd64 Packages
404 Not Found
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http://ppa.launchpad.net saucy/main i386 Packages
404 Not Found
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http://ppa.launchpad.net saucy/main Translation-pt_BR
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http://ppa.launchpad.net saucy/main Translation-pt
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http://ppa.launchpad.net saucy/main Translation-pt_PT
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http://ppa.launchpad.net saucy/main Translation-pt_BR
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http://ppa.launchpad.net saucy/main Translation-pt
Atingido
https://download.01.org saucy/main amd64 Packages
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http://ppa.launchpad.net saucy/main Translation-pt_PT
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http://ppa.launchpad.net saucy/main Translation-en
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https://download.01.org saucy/main i386 Packages
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http://ppa.launchpad.net saucy/main Translation-pt_BR
Obter:22
https://download.01.org saucy/main Translation-pt_BR [1.013 B]
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https://download.01.org saucy/main Translation-pt_BR
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http://ppa.launchpad.net saucy/main Translation-pt
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https://download.01.org saucy/main Translation-pt_PT
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https://download.01.org saucy/main Translation-en
Baixados 517 kB em 1min 4s (7.987 B/s)
Lendo listas de pacotes... Pronto
W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy/InRelease W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy-updates/InRelease W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy-backports/InRelease W: Falhou ao buscar
http://extras.ubuntu.com/ubuntu/dists/saucy/InRelease W: Falhou ao buscar
http://ppa.launchpad.net/format-junkie-team/release/ubuntu/dists/saucy/main/binary-amd64/Packages 404 Not Found
W: Falhou ao buscar
http://ppa.launchpad.net/format-junkie-team/release/ubuntu/dists/saucy/main/binary-i386/Packages 404 Not Found
W: Falhou ao buscar
http://ppa.launchpad.net/openshot.developers/ppa/ubuntu/dists/saucy/main/binary-amd64/Packages 404 Not Found
W: Falhou ao buscar
http://ppa.launchpad.net/openshot.developers/ppa/ubuntu/dists/saucy/main/binary-i386/Packages 404 Not Found
W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy/Release.gpg Não foi possível resolver 'br.archive.ubuntu.com'
W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy-updates/Release.gpg Não foi possível resolver 'br.archive.ubuntu.com'
W: Falhou ao buscar
http://br.archive.ubuntu.com/ubuntu/dists/saucy-backports/Release.gpg Não foi possível resolver 'br.archive.ubuntu.com'
W: Falhou ao buscar
http://extras.ubuntu.com/ubuntu/dists/saucy/Release.gpg Não foi possível resolver 'extras.ubuntu.com'
W: Falhou o download de alguns ficheiros de índice. Foram ignorados ou os antigos foram usados em seu lugar.
Lendo listas de pacotes... Pronto
Construindo árvore de dependências
Lendo informação de estado... Pronto
ubuntu-restricted-extras já é a versão mais nova.
0 pacotes atualizados, 0 pacotes novos instalados, 0 a serem removidos e 0 não atualizados.
elifaz@PC1-MS-7788:~$