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Possible Duplicate:
How can I fix a 404 Error using a PPA?

When i try to check updates comes

W:Failed to fetch http://ppa.launchpad.net/kayo-k11-4/nv-switcheroo/ubuntu/dists/oneiric/main/source/Sources  404  Not Found
W:Failed to fetch http://ppa.launchpad.net/kayo-k11-4/nv-switcheroo/ubuntu/dists/oneiric/main/binary-i386/Packages  404  Not Found
E:Some index files failed to download. They have been ignored, or old ones used instead.

What i must do?

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2 Answers 2

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remove this repository from your sources: go to System Settings then Software Sources then look for this repository under Other Software

(if it is not immediately obvious, you may have to click Edit to see the URL of each repository in that list)

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If you go to the ppa at http://ppa.launchpad.net/kayo-k11-4/ you will see the nv-switcheroo ppa does not have a binary for oneiric. You can either remove that repository as mentioned by totaam or fix it to point to the existing maverick source. If you need help with that, note a comment and I'll point you in the right direction since it changed in oneiric.

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