Ubuntu 18.04 GeForce 820m Nvidia 430

I have a laptop with a GeForce 820m graphics card, which according to the Nvidia website is compatible with the Nvidia driver version 430, which I would like to set up for Vulkan, however it's not showing up as available, only the 340 version. I have oibaf graphics drivers and xorg edgers PPAs enabled. Previously I had pkcs#7 signature not signed issues which are still present in the logs, but now the system at least starts and I have 3D acceleration since I added nvidia-drm.modeset=1 to grub. Is there any way to get the later 430 Nvidia driver?

No, Nvidia stopped supporting 820m since 390.xx. 820m has 450 drivers available both on windows and linux, but it is fake. Max version of 820m on windows in 391.xx and on linux is 390xx.

This GPU works best on gdm, boot Ubuntu 20.04 with nomodeset (search google what is nomodeset). Connect to wifi and open terminal. Enter sudo service gdm stop. You will get black screen. Press Ctrl + Alt + F4. After that enter your credentials and enter sudo apt install nvidia-340. After an install enter sudo reboot. Make sure your GPU works by entering Nvidia settings in App Menu. If it works, you can install 390xx. Go to terminal and enter sudo service gdm stop, press Ctrl + Alt + F4 and enter your credentials. After that enter sudo add-apt-repository ppa:graphics-drivers/ppa. Press Enter. Then enter sudo apt update. After that enter sudo apt install nvidia-driver-390. After an installation completed, enter sudo reboot. And you successfully installed 390xx. I did it my self on my Inspiron 3443 with 820m graphics and it works perfectly. Im happy

Source: If you try to install driver higher than 390xx, it will give a 820m is not supported warning