How To Solve An Expired Key Expkeysig With Apt Tecadmin

Error

Here is logs on my Debian 9 system: Use the following command to list all keys configured for apt on your system. You will see the expired key like this.

Solution:

Now, update the expired key by running the below command. Here 8C718D3B5072E1F5 is the key was expired on my system. You must change 8C718D3B5072E1F5 with the expired key on your system.