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The upgrade is successfully started, but then got this error:

Failed to fetch 404 Not Found [IP: 80]

The Internet connection is fine. When I simply open that URL in browsed I still get 404.


deb oneiric main restricted
deb-src oneiric main restricted

deb oneiric-updates main restricted
deb-src oneiric-updates main restricted

deb oneiric universe
deb-src oneiric universe
deb oneiric-updates universe
deb-src oneiric-updates universe

deb oneiric multiverse
deb-src oneiric multiverse
deb oneiric-updates multiverse
deb-src oneiric-updates multiverse

deb oneiric-security main restricted
deb-src oneiric-security main restricted
deb oneiric-security universe
deb-src oneiric-security universe
deb oneiric-security multiverse
deb-src oneiric-security multiverse

deb oneiric main
deb-src oneiric main
deb-src lucid partner
deb-src dapper main multiverse
deb-src dapper-updates main multiverse
deb lucid partner
deb-src lucid partner

How can I get through this?

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marked as duplicate by guntbert, Thomas Ward, karel, Florian Diesch, Avinash Raj Dec 18 '13 at 7:37

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.

@JacobJohanEdwards here's the /etc/apt/sources.list – alexaschka May 2 '12 at 9:55
no, we have mixed sources, and two of them EOL. – guntbert Dec 17 '13 at 21:09
up vote 1 down vote accepted

For some reason you trying to download Ubuntu 6.06 aka Dapper Drake which is of course not supported for some time. You should check your Software Sources or check file /etc/apt/sources.list.

Looking at your file:

deb-src dapper main multiverse
deb-src dapper-updates main multiverse
deb lucid partner
deb-src lucid partner

These lines need to be commented out:

sudo nano /etc/apt/sources.list

add a # in-front of the lines above i.e.

#deb-src dapper main multiverse
#deb-src dapper-updates main multiverse
#deb lucid partner
#deb-src lucid partner



sudo apt-get update && sudo apt-get upgrade


Then perform the upgrade as per:

How do I upgrade from 10.04 or 11.10 to 12.04?

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Thanks! Fixed. Updated successfully. – alexaschka May 3 '12 at 7:52

as stated above the Ubuntu server failed due to some other reasons. You can either wait for the issue to be fixed or you can simply download the Ubuntu 12.04 iso boot it up and click "Update Ubuntu" in the Ubuntu installer.

Maybe you can upgrade your system this way.

I hope this was helpful. :)

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