Install updates error log Wine

[Nicholas A Delmore]

New to Linux and not tech savvy. Would like to avoid Win 10 when Win 7 expires!
Here is the log that i was prompted to post on this forum after a software update attempt.
Im also interested in learning how to install and use wine in order to run 1 old WinXP app, Quickbooks 2000.
Any help, suggestions, directions
will be really appreciated.
Thanks,

N

Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Hit:1 http://repo.linuxliteos.com/linuxlite diamond InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Get:3 https://dl.winehq.org/wine-builds/ubuntu bionic InRelease [6,257 B]
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Hit:5 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Hit:6 http://archive.canonical.com/ubuntu bionic InRelease
Hit:7 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Get:8 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Hit:9 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Err:3 https://dl.winehq.org/wine-builds/ubuntu bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
Reading package lists...
W: GPG error: https://dl.winehq.org/wine-builds/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
E: The repository 'https://dl.winehq.org/wine-builds/ubuntu bionic InRelease' is not signed.