Problema ao instalar aplicativos no ubuntu 10.04

[railander]

Ao tentar instalar ao aplicativo no ubuntu 10.04 me surge o seguinte erro:

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W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B6C6326781C0BE11
W: Failed to fetch http://archive.canonical.com/dists/lucid/Release  Unable to find expected entry  partne/binary-amd64/Packages in Meta-index file (malformed Release file?)

E: Some index files failed to download, they have been ignored, or old ones used instead.


Ao tentar instalar pelo Ubuntu Software center ocorre os erros:


Failed to fetch http://br.archive.ubuntu.com/ubuntu/pool/universe/libc/libcdio/libiso9660-7_0.81-4_amd64.deb 404  Not Found
Failed to fetch http://br.archive.ubuntu.com/ubuntu/pool/universe/s/sdl-image1.2/libsdl-image1.2_1.2.10-1_amd64.deb 404  Not Found

Alguem sabe como resolver? (sou iniciante).

[JoseMelo]

No terminal:

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gpg --keyserver keyserver.ubuntu.com --recv B6C6326781C0BE11
gpg --export --armor B6C6326781C0BE11 | sudo apt-key add -

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sudo apt-get update