MySQL Repository Key Expired

TLDR; The one-liner that fixes this is the following:

sudo apt-key adv --recv-keys --keyserver ha.pool.sks-keyservers.net 5072E1F5

Which basically fetches the new key and installs it into the keyring.

A bit more detail:

You can find the expired key by executing the following command:

LANG=C apt-key list | grep expired

Which outputs something like this: pub 1024D/5072E1F5 2003-02-03 [expired: 2019-02-17] 5072E1F5 is the key ID, which we used in the command above.

Another one-liner that's recommended in the bug report below is this one:

sudo apt-key adv --recv-keys --keyserver pgp.mit.edu 5072E1F5

But I couldn't get it to work.

More reading from when this happened the last time.

https://bugs.mysql.com/bug.php?id=85029

This issue has been raised to MySQL already Bug#94378.

Workaround which helped me on Ubuntu 16.04, installed latest Ubuntu / Debian (Architecture Independent), DEB Package mysql-apt-config_0.8.12-1_all.deb

You can try this workaround.