Ubuntu 16.04.7 LTS: xenial-pgdg Release' does not have a Release file.

[Jonesy]

On Fri, 23 Sep 2022 09:15:00 +0200, robert rottermann wrote:
> Hi Colleagues
>
> when I try to apt update my Ubuntu 16.04.7 LTS server, I get the error
>
> W: The repository 'http://apt.postgresql.org/pub/repos/apt xenial-pgdg Release' 
> does not have a Release file.
> W: Failed to fetch 
> http://apt.postgresql.org/pub/repos/apt/dists/xenial-pgdg/main/binary-amd64/Packages: 
> 404  Not Found [IP: 217.196.149.55 80]
>
>
> what can I do to fix this?

Install a release whose support was not dropped several years ago.