nvidia-driver gets a code 1

[Charles Kroeger <mbone@gmx.co.uk>]

System Information
GTK 3.24.36 / GLib 2.74.5
Locale: en_US.UTF-8 (charset: UTF-8)
Operating System: Linux 6.1.0-3-amd64 (x86_64)
aka Debian 12 bookworm/testing

I ran nvidia-detect:

~# nvidia-detect
Detected NVIDIA GPUs:
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP108 [GeForce
GT 1030] [10de:1d01] (rev a1)

Checking card:  NVIDIA Corporation GP108 [GeForce GT 1030] (rev a1)
Your card is supported by all driver versions.
Your card is also supported by the Tesla drivers series.
Your card is also supported by the Tesla 470 drivers series.
It is recommended to install the
    nvidia-driver

on doing a dist-upgrade dpkg says this:

dpkg: dependency problems prevent configuration of nvidia-driver:
 nvidia-driver depends on nvidia-kernel-dkms (= 525.89.02-1) |
nvidia-kernel-525.89.02 | nvidia-open-kernel-525.89.02 |
nvidia-open-kernel-525.89.02; however:
  Version of nvidia-kernel-dkms on system is 515.86.01-1.
  
Package nvidia-kernel-525.89.02 is not installed.
 Package nvidia-open-kernel-525.89.02 is not installed.
 Package nvidia-open-kernel-525.89.02 is not installed.

This wouldn't seem too much of a problem, just install
nvidia-open-kernel-525-89.02, right?

# apt install nvidia-open-kernel-525.89.02
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package nvidia-open-kernel-525.89.02 is not available, but is referred to
by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Where is this nvidia-open-kernel-525.89.02 ?

There was an advisory by Andreas Beckmann the firmware-gsp package being
moved to the newly created 'non-free-firmware' archive area. 

This area needs to be enabled in
  /etc/apt/sources.list (/etc/apt/sources.list.d/*.list) in addition to
  'non-free' in order to upgrade to the 525 driver series.

He gives this locaton:
https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#non-free-split

however my /etc/apt/sources.list uses a different syntax to the location
Andreas has given and so it can't be read. I attempted to make his location
fit the syntax but then apt didn't trust the site and wouldn't use it in
the update

I need to get nvidia-driver working.  Without this driver there is also no
sound. I did make an image of the drive before doing the upgrade or I
wouldn't be writing this.

I did a dpkg -s nvidia-driver and got a lot of stuff about it but there was
this:

Please see the nvidia-kernel-dkms (nvidia-open-kernel-dkms)
 or nvidia-kernel-source (nvidia-open-kernel-source) packages
 for building the kernel module required by this package.
 This will provide nvidia-kernel-525.89.02
 (nvidia-open-kernel-525.89.02).

C. Kroeger --help