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How to install software or upgrade from old unsupported release?

While I'm upgrading my Ubuntu from 12.04 to 12.10 the following error is occurred in distribution upgrade,

W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/maverick/main/source/Sources

404 Not Found
E:Some index files failed to download. They have been ignored, or old ones used instead

Does anybody know whats happening?

Community
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Karan Singh
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    Maverick is not 12.04 is 10.10, why do you have the Maverick repositories enabled? did you upgraded from previous versions? – Uri Herrera Dec 13 '12 at 04:42
  • Yep, I've upgraded the maverick to 12.04. Please tell me how to disable the maverick repositories. – Karan Singh Dec 13 '12 at 05:12

1 Answers1

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Maverick is no longer supported. Remove references to maverick repositories from /etc/apt/sources.list and from files in /etc/apt/sources.list.d/. Make sure that you still have references to quantal. After editing these files, run sudo apt-get update.

jdthood
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