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How to fix Ubuntu 14.04 update-manager as I have problems with this:

W: fail to find http://archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/source/Sources 404 Not found
/universe/source/Sources 404 Not found
/multiverse/bynary-i386/Packages 404 Not found
W: fail to find http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/source/Sources 404 Npot Found
/main/binary-i386/Packages 404 Not Found
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marked as duplicate by chaskes, Wilf, Jorge Castro, Warren Hill, Eric Carvalho Aug 2 '14 at 14:11

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 question may help: How to install software or upgrade from old unsupported release?. Ubuntu 11.04 is no longer supported, which is why you are getting those errors. –  Wilf Jul 30 '14 at 22:57
@Wilf I don't think thats the correct duplicate. OP says they are using 14.04 This one 404 error while checking for update may be better. –  Warren Hill Aug 2 '14 at 10:42

1 Answer 1

You have repos for unsupported versions of ubuntu. Delete the lines in /etc/apt/sources.list that match the URL with natty

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