Ubuntu 20.04.6 LTS apt problems - how to upgrade f/w?

[Colin Law]

On Tue, 26 Nov 2024 at 07:32, Bo Berglund <bo.berglund at gmail.com> wrote:

> Err:7 https://apt.svtplay-dl.se svtplay-dl InRelease
>   The following signatures couldn't be verified because the public key is not
> available: NO_PUBKEY D3D19C99F5FA3AA7

There will be an entry for that either in /etc/apt/sources.list or in
a file in /etc/apt/sources.list.d
Find that and remove it.

Colin L