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Possible Duplicate:
How can I fix a 404 Error using a PPA?
Getting “Failed to download repository information” error while updating?

I have started to get broken repository links a few days ago. When I run sudo apt-get update I get errors like this:

..
Err http://tr.archive.ubuntu.com precise/main Sources
  404  Not Found
Err http://tr.archive.ubuntu.com precise/restricted Sources
  404  Not Found
Err http://tr.archive.ubuntu.com precise/universe Sources
  404  Not Found
Err http://tr.archive.ubuntu.com precise/multiverse Sources

..
W: Failed to fetch http://tr.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://tr.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://tr.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/binary-amd64/Packages  404  Not Found

I don't remember doing anything special. Is it just me? How can I fix this?

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marked as duplicate by Tom Brossman, Salem, fabricator4, Ringtail, fossfreedom♦ Dec 26 '12 at 0:52

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