sudo apt-get update throw error message constantly

[oren tal]

Whenever I do sudo apt-get update, Iget the following message:

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/main/source/Sources 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/source/Sources 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/source/Sources 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/multiverse/source/Sources 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/main/binary-amd64/Packages 404 Not Found

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

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

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

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/main/binary-i386/Packages 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/binary-i386/Packages 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/binary-i386/Packages 404 Not Found

W: Failed to fetch http://il.archive.ubuntu.com/ubuntu/dists/natty-backports/multiverse/binary-i386/Packages 404 Not Found

How can I fix this?

[slickymaster]

You're using a mirror that is down or not updated. See How can I get apt to use a mirror close to me? (http://askubuntu.com/q/37753/6969) for a way to change mirrors.

[fantab]

'Natty' or Ubuntu 11.04 is dead. Meaning it has reached its 'end of life (https://wiki.ubuntu.com/Releases)', and Ubuntu no longer supports it. So you will not get any updates to it. The repositories for 'natty' don't exist.

Install the latest version of Ubuntu or Ubuntu LTS.