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I'm trying to upgrade my 13.04 to 13.10 in anticipation to 14.04. However, the dist-upgrade fails as there is a 404 on a repository. That repository is the "natty-backports". It's normal, as it's very old.

However, I cannot find any connections to that repository. When I grep the /etc/apt/sources.list it isn't there. When I look through the sources.list.d/ directory files, it also doesn't show up there. When I CTRL+F "natty" in the Software Center sources window, it doesn't show up. It's like a ghost repository.

I tried doing a sudo apt-get clean && sudo apt-get update, but that didn't help either. When I do these commands, I make sure the Software Center is closed.

Is there some other directory/file apt-get gets its sources from?

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