I was installing Wine on linux and up on following the guide instructions on this article, install wine, I came across these errors :-
W: GPG error: https://dl.winehq.org/wine-builds/ubuntu xenial 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 xenial InRelease' is not signed.
I looked for solutions but I could not find one. I decided to create a post and my solution to this problem. Find the solution in the answers.
The solution is easy.
Add the required public key using the below command line:-
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 76F1A20FF987672F
Now you can run:-
sudo apt update && sudo apt upgrade -y
And you are sorted