Invalid Signature when updating via apt & Ubuntu?

Plex Media Server Desktops & Laptops
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Server Version#: Linux brainiac1 5.0.0-13-generic #14-Ubuntu SMP Mon Apr 15 14:59:14 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Player Version#: 1.15.4.993

Trying to update Plex to the latest version via apt - however am getting the following apt error

Ign:5 https://downloads.plex.tv/repo/deb public Release.gpg
Reading package lists… Done
W: GPG error: https://downloads.plex.tv/repo/deb public Release: The following signatures were invalid: BADSIG 97203C7B3ADCA79D Plex Inc.
E: The repository ‘https://downloads.plex.tv/repo/deb public Release’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.

Does anyone know how to obtain the valid sig?

Thanks in advance.

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I’m having the same issues. Here’s a temporary workaround (SECURITY WARNING) of ignoring the signatures and updating/upgrading the packages anyway.

sudo apt -o Acquire::AllowInsecureRepositories=true update
sudo apt -o Acquire::AllowInsecureRepositories=true upgrade

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