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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  404  Not Found
W:Failed to fetch  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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marked as duplicate by Jorge Castro, Marco Ceppi Jan 3 '12 at 22:46

This question was marked as an exact duplicate of an existing question.

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 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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