[nmglug] How to find/import public keys? Or is there another problem?

[Tom Ashcraft]

As my resources as an individual seem exhausted, I request assistance 
from the NMGLUG hive mind re:

tom at tom-HP-Notebook:~$ gpg --verify youtube-dl.sig /usr/local/bin/youtube-dl
gpg: Signature made Fri 07 Jun 2019 02:48:58 PM MDT
gpg:                using RSA key ED7F5BF46B3BBED81C87368E2C393E0F18A9236D
gpg: Can't check signature: No public key                             
                 <----?


Context from https://ytdl-org.github.io/youtube-dl/download.html:

To check the signature, type: |sudo wget 
https://yt-dl.org/downloads/latest/youtube-dl.sig -O youtube-dl.sig
gpg --verify youtube-dl.sig /usr/local/bin/youtube-dl
rm youtube-dl.sig|

The following GPG keys will be used to sign the binaries and the git tags:

  * Philipp Hagemeister |7D33 D762 FD6C 3513 0481 347F DB4B 54CB A482 6A18|
  * Sergey M. |ED7F 5BF4 6B3B BED8 1C87 368E 2C39 3E0F 18A9 236D|


Should I be able to do something like this?:

>From https://mxlinux.org/wiki/system/signed-iso-files/#MX-15%20and%20later:

...

1. If you have not already downloaded appropriate key, copy/paste this 
command into a terminal as regular user:

/|$ |/|gpg --keyserver ||hkp://keys.gnupg.net| 
<http://keys.gnupg.net>|--recv-keys 4A0C4F9C 0679EE98 F09C5B1C|

This will give you....


Also, all of the above relates to perennial update issues and not having 
a very clear understanding about how and whether I should have something 
like a 'youtube-dl. list' file under '/etc/apt/sources.list.d'

Thanks,

Tom

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