NVIDIA G98M [GeForce 9300M GS] supported drivers on Ubuntu 21.04

Hello,
I have “jumped into cold water” by installing devel version Kubuntu 21.04. But - besides the many to be expected daily updates - most things work like a charm.
Now I have a question not necessarily related to K 21.04 proper:

inxi -F shows the respective parts of my laptop to be the following:
System: Host: hslaptop Kernel: 5.10.0-14-generic x86_64 bits: 64 Desktop: KDE Plasma 5.21.2
Distro: Ubuntu 21.04 (Hirsute Hippo)
Machine: Type: Laptop System: Sony product: VGN-AW11M_H v: C6010CXT serial:
Mobo: Sony model: VAIO serial: BIOS: American Megatrends v: R0200Y2 date: 08/12/2008
Battery: ID-1: BAT0 charge: 71.3 Wh condition: 72.2/73.3 Wh (98%)
CPU: Info: Dual Core model: Intel Core2 Duo P8400 bits: 64 type: MCP L2 cache: 3 MiB
Speed: 1596 MHz min/max: 1600/2267 MHz Core speeds (MHz): 1: 1596 2: 1596
Graphics: Device-1: NVIDIA G98M [GeForce 9300M GS] driver: nouveau v: kernel
Device-2: Ricoh Visual Communication Camera VGP-VCC9 [R5U870] type: USB driver: uvcvideo
Display: x11 server: X.Org 1.20.10 driver: loaded: modesetting unloaded: fbdev,vesa resolution: 1680x945~60Hz
OpenGL: renderer: N/A v: N/A

As can be seen, it is a pretty ancient Sony laptop with an NVIDIA G98M graphics card. It uses the open NOUVEAU driver, which I actually did not
expect to work anymore on kernel 5.10 - but it does - at least for my “run-of-the-mill” type of usage (eg. no gaming!).

Can anybody tell me what - if any - newer proprietary NVIDIA driver might support this old graphics card on kernel 5.10?
sudo ubuntu-drivers devices returns

driver : nvidia-340 - distro non-free recommended and
driver : xserver-xorg-video-nouveau - distro free builtin.

Putting it differently: is there any driver - newer than nvidia-340 that supports the graphics car on
kernel 5.10?

Thanks for any hints.
Regards
H. Stoellinger

https://www.nvidia.com/en-us/drivers/unix/legacy-gpu/

There is no newer driver available, and it will not work with the 5.10 kernel.
Is there any older kernel available in your distros repos?