Fetch Failed using Update Manager

Nelson asked:

I’m getting this error message when I try to use Update Manager:
“Fetch failed: W:Failed to fetch file:/mnt/disk/dists/squeeze/main/binary-amd64/Packages.gz File not found”

Any idea what might have happened to the .gz file that it references? That directory is empty.

My answer:

You’ve set up the installation CD, or some other external media, as an installation source in /etc/apt/sources.list. Just comment or remove it.

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