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How to install software or upgrade from old unsupported release?

These update errors are preventing upgrade Ubuntu 11.04. (I want to ultimately upgrade to 12.04):

http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources  404 Not Found
http://extras/ubuntu.com/ubuntu/dists/natty/main/binary-amd64/Packages  404 Not Found
http://extras/ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages  404 Not Found

I check for updates pretty often but recently these have cropped up. I'm learning as I go but need some assistance to resolve this. Any guidance would be greatly appreciated.

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marked as duplicate by Eliah Kagan, Eric Carvalho, Jorge Castro, fabricator4, Anwar Shah Jan 9 '13 at 8:10

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2 Answers 2

This is because Natty Narwhal has expired(End of Life) and its your chance to upgrade to higher version. reference

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it seems that extras not available in extras.ubuntu.com you need to disable the request by editing source list use following command

sudo gedit /etc/apt/sources.list

add # in following urls Eg. "#http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources" "#http://extras/ubuntu.com/ubuntu/dists/natty/main/binary-amd64/Packages" "#http://extras/ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages"

and try updating.

or upgrade distro

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Got it! Did it! Even upgraded to 12.04! Now I'm back to resolving the complete lack of audio output like my last upgrade... Thanks all! –  BBonham Jan 9 '13 at 6:32

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