Aí estão os comandos:
sudo apt-get update
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http://packages.linuxmint.com maya InRelease
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http://packages.linuxmint.com maya Release.gpg [197 B]
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http://packages.linuxmint.com maya Release [17,7 kB]
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http://packages.linuxmint.com maya/main i386 Packages [18,0 kB]
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http://packages.medibuntu.org precise InRelease
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http://packages.linuxmint.com maya/upstream i386 Packages [10,6 kB]
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http://packages.linuxmint.com maya/import i386 Packages [41,4 kB]
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http://packages.medibuntu.org precise/free i386 Packages
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http://security.ubuntu.com precise-security InRelease
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http://security.ubuntu.com precise-security Release.gpg [198 B]
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http://security.ubuntu.com precise-security Release [49,6 kB]
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http://packages.medibuntu.org precise/non-free i386 Packages
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http://archive.canonical.com precise/partner i386 Packages
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http://archive.ubuntu.com precise Release.gpg
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http://security.ubuntu.com precise-security/main i386 Packages [163 kB]
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http://archive.ubuntu.com precise-updates Release.gpg [198 B]
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http://archive.ubuntu.com precise Release
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http://security.ubuntu.com precise-security/restricted i386 Packages [3.968 B]
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http://security.ubuntu.com precise-security/universe i386 Packages [41,6 kB]
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http://security.ubuntu.com precise-security/multiverse i386 Packages [2.369 B]
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http://security.ubuntu.com precise-security/main TranslationIndex
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http://security.ubuntu.com precise-security/multiverse TranslationIndex
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http://security.ubuntu.com precise-security/multiverse Translation-en
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http://security.ubuntu.com precise-security/universe Translation-en
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http://archive.ubuntu.com precise-updates Release [49,6 kB]
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http://archive.ubuntu.com precise/main i386 Packages
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http://ppa.launchpad.net precise InRelease
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http://ppa.launchpad.net maya InRelease
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http://archive.canonical.com precise/partner Translation-en
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http://archive.ubuntu.com precise/universe i386 Packages
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http://archive.ubuntu.com precise/multiverse i386 Packages
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http://archive.ubuntu.com precise/main TranslationIndex
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http://archive.ubuntu.com precise/multiverse TranslationIndex
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http://archive.ubuntu.com precise/universe TranslationIndex
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http://ppa.launchpad.net precise InRelease
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http://archive.ubuntu.com precise-updates/main i386 Packages [379 kB]
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http://ppa.launchpad.net precise Release.gpg [316 B]
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http://ppa.launchpad.net maya/main Sources
404 Not Found
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404 Not Found
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Obter:16
http://archive.ubuntu.com precise-updates/restricted i386 Packages [6.732 B]
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http://archive.ubuntu.com precise-updates/universe i386 Packages [127 kB]
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http://archive.ubuntu.com precise-updates/multiverse i386 Packages [9.672 B]
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Baixados 921 kB em 24s (38,3 kB/s)
W: Erro GPG:
http://ppa.launchpad.net precise Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 7E492AAE24DF7CC4
W: Falhou ao buscar
http://ppa.launchpad.net/stoq-dev/lancamentos/ubuntu/dists/maya/main/source/Sources 404 Not Found
W: Falhou ao buscar
http://ppa.launchpad.net/stoq-dev/lancamentos/ubuntu/dists/maya/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
_______________________________________________________________________________________________________________________________
Ao atualizar pelo synaptic dá isso:
Erro GPG:
http://ppa.launchpad.net precise Release: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 7E492AAE24DF7CC4Falhou ao buscar
http://ppa.launchpad.net/stoq-dev/lancamentos/ubuntu/dists/maya/main/source/Sources 404 Not Found
Falhou ao buscar
http://ppa.launchpad.net/stoq-dev/lancamentos/ubuntu/dists/maya/main/binary-i386/Packages 404 Not Found
Some index files failed to download. They have been ignored, or old ones used instead.