Proper way to set up or change a preferred gpg keyserver in ubuntu 20.04?

I am using ubuntu server 20.04. I am attempting to download developer public gpg/pgp keys from keyservers. For many of the keys that I want, they don't seem to be listed on ubuntu's default key servers. The ones that are listed, don't seem to be accurate or otherwise seem outdated or expired. What I want to do is, when trying to download a public key on ubuntu, make ubuntu default towards looking up the requested key from the most stringent (email requirement wise) keyserver (https://keys.openpgp.org/) first, and then, if not found, to automatically look up the key from a more lax and more compatable keyserver (hkp://pool.sks-keyservers.net).

The first issue I have, is that I can't find any settings in the terminal where ubuntu stores its default permanent key-server addresses when doing key lookups/downloads. So, my questions are:

1. Where is the default ubuntu keyserver setting located (what file can I modify to change the default keyserver permanently in ubuntu?)?
2. How Can I set 2 keyservers (in ubuntu) with their order being their preference in which ubuntu places requests to them? Such that keyserver1=https://keys.openpgp.org/ and keyserver2=hkp://pool.sks-keyservers.net, so that if a key cannot be found on keyserver1, then ubuntu searches for the key on keyserver2?

Thanks for any help!

Where is the default ubuntu keyserver setting located (what file can I modify to change the default keyserver permanently in ubuntu?)?

By default this is in ~/.gnupg/gpg.conf. If you do not have this file/directory, you can invoke gpg --version in order to see where your copy of GPG is set to store its configuration.

How Can I set 2 keyservers (in ubuntu) with their order being their preference in which ubuntu places requests to them? Such that keyserver1=https://keys.openpgp.org/ and keyserver2=hkp://pool.sks-keyservers.net, so that if a key cannot be found on keyserver1, then ubuntu searches for the key on keyserver2?

In the configuration file, which includes instructions as a comment, you will find the following:

> # GnuPG can automatically locate and retrieve keys as needed using the
> # auto-key-locate option.  This happens when encrypting to an email
> # address (in the "[email protected]" form), and there are no
> # [email protected] keys on the local keyring.  This option takes the
> # following arguments, in the order they are to be tried:
> # 
> # cert = locate a key using DNS CERT, as specified in RFC-4398.
> #        GnuPG can handle both the PGP (key) and IPGP (URL + fingerprint)
> #        CERT methods.
> #
> # pka = locate a key using DNS PKA.
> #
> # ldap = locate a key using the PGP Universal method of checking
> #        "ldap://keys.(thedomain)".  For example, encrypting to
> #        [email protected] will check ldap://keys.example.com.
> #
> # keyserver = locate a key using whatever keyserver is defined using
> #             the keyserver option.
> #
> # You may also list arbitrary keyservers here by URL.

The relevant part is the fifth line: "in the order they are to be tried"

Unfortunately, I could not find my gpg.conf file anywhere. So in order to get a hardened gpg configuration file, I downloaded a Hardened gpg.conf file from Dr.Duh's github page at github.com/drduh/config/blob/master/gpg.conf

Then I modified it to include the keyservers of my desire, in the order I want Mac OS to read them, with the keyserver at the top, being the first one macOS reads.