If you’re getting the error message that says that the signature couldn’t be verified because the public key is not available after running sudo apt-get update in ubuntu 10.04 and 10.10 then read more and I will guide you how to solve this problem. The error message probably looks like below:
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://extras.ubuntu.com maverick Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY DB141E2302FDF932
Your Pubkey may be different so please copy the key after “NO_PUBKEY”. In my case it is DB141E2302FDF932.
Now run the following command:
gpg –keyserver keyserver.ubuntu.com –recv DB141E2302FDF932
gpg –export –armor DB141E2302FDF932 | sudo apt-key add –
sudo apt-get update
Now run:
sudo apt-get update
Now you shouldn’t get any error messages.
If you still get an error message please post your error here in the comment.