"Alternative (discouraged): Creating a new key" <---- AVOID, BETTER RENEW, see below

Renew expired key:

gpg –list-keys
this gives you a list of all the keys on your computer. you need this to find the keyname that you are trying to update.

 gpg --edit-key  [key id]

command> list
lists the available subkeys

command> key [subkey]
choose the number of the subkey you want to edit; e.g. key 0 for primary

command> expire
expire lets you set a new experation date for the subkey.

command> save
It's straightforward … once you know how to do it. ??

(if you have any problem just check my notes about the config file, over SSH it worked, after changing the pinentry-program. of course you also need the private key)