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I am trying to install Image Scan! bundle from Epson for my GT-1500 scanner. When I run ./install.sh I get the error:

W: GPG error: https://downloads.plex.tv/repo/deb public InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 97203C7B3ADCA79D
E: The repository 'https://downloads.plex.tv/repo/deb public InRelease' is not signed.

I looked into --allow-unauthenticated but doesn't seem to work for my case.

j_n_ca
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