Seems to be because the Nvidia 470 kernel driver does not support your GT 730 GPU:
[ 5.887374] NVRM: The NVIDIA GeForce GT 730 GPU installed in this system is NVRM: supported through the NVIDIA 390.xx Legacy drivers. Please NVRM: visit http://www.nvidia.com/object/unix.html for more NVRM: information. The 470.239.06 NVIDIA driver will ignore NVRM: this GPU. Continuing probe...
And yet their documentation says it should still be supported:
Seems to be because the Nvidia 470 kernel driver does not support your GT 730 GPU:
[ 5.887374] NVRM: The NVIDIA GeForce GT 730 GPU installed in this system is
NVRM: supported through the NVIDIA 390.xx Legacy drivers. Please
NVRM: visit http:// www.nvidia. com/object/ unix.html for more
NVRM: information. The 470.239.06 NVIDIA driver will ignore
NVRM: this GPU. Continuing probe...
And yet their documentation says it should still be supported:
https:/ /download. nvidia. com/XFree86/ Linux-x86_ 64/470. 239.06/ README/ supportedchips. html
So I guess the docs are wrong and we should not be offering Nvidia 470 for the GT 730. Instead, you have three options:
1. Uninstall the Nvidia driver and use the default open source driver instead.
2. Install Ubuntu 22.04 instead, which was the last release to fully support Nvidia's 390 driver.
3. Install a newer graphics card.
Running KDE it's also possible you will encounter bug 2063143.