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Possible Duplicate:
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):  404 Not Found
http://extras/  404 Not Found
http://extras/  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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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 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/" "#http://extras/"

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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