update BADSIG Ubuntu 8.10 Intrepid Ibis

Fixed with

First time:
sudo apt-get update -o Acquire::http::No-Cache=true

Second time above didn't work, used:

Go to Administration, "Software sources"
Click "Download from" drop-down
Select "Other"
Click button on upper right "Select Best server".
After it tests the servers, click on "Choose Server"


Problem

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://us.archive.ubuntu.com intrepid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/intrepid-updates/Release

W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems

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