broken repository?

[Alan]

I am unable to update mysql-client. Here's what I get:

alan ~ $sudo apt update

Get:1 http://repo.mysql.com/apt/ubuntu focal InRelease [12.9 kB]

Err:1 http://repo.mysql.com/apt/ubuntu focal InRelease

The following signatures couldn't be verified because the public key is 
not available: NO_PUBKEY 467B942D3A79BD29

Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease

Get:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]

Hit:4 http://archive.canonical.com/ubuntu focal InRelease

Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]

Hit:6 http://dell.archive.canonical.com focal InRelease

Reading package lists... Done

W: GPG error: http://repo.mysql.com/apt/ubuntu focal InRelease: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY 467B942D3A79BD29

E: The repository 'http://repo.mysql.com/apt/ubuntu focal InRelease' is 
not signed.

N: Updating from such a repository can't be done securely, and is 
therefore disabled by default.

I am also trying to get help from mysql, but no help so far (they 
referred me to an article about INSTALLING mysql).

This issue is apparently preventing me from upgrading to 22.04. I am 
running 20.04 LTS.

Thanks,

Alan Shank
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