nvidia dkms not support kernel when mannuly compile 5.15.65-rt49 / 5.10.140-rt73kernel

For diagnostic purposes, what is the output of the commands

uname -a
lsb_release -crid
apt policy nvidia-dkms-515 nvidia-dkms-510

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.

Linux ascend-GE76-Raider-11UH 5.15.0-48-generic #54~20.04.1-Ubuntu SMP Thu Sep 1 16:17:26 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Distributor ID: Ubuntu
Description: Ubuntu 20.04.5 LTS
Release: 20.04
Codename: focal

nvidia-dkms-510:
  Installed: 510.85.02-0ubuntu0.20.04.1
  Candidate: 510.85.02-0ubuntu0.20.04.1
  Version table:
 *** 510.85.02-0ubuntu0.20.04.1 500
        500 https://mirrors.ustc.edu.cn/ubuntu focal-updates/restricted amd64 Packages
        500 https://mirrors.ustc.edu.cn/ubuntu focal-security/restricted amd64 Packages
        100 /var/lib/dpkg/status
nvidia-dkms-515:
  Installed: (none)
  Candidate: 515.76-0ubuntu0.20.04.1
  Version table:
     515.76-0ubuntu0.20.04.1 500
        500 https://mirrors.ustc.edu.cn/ubuntu focal-proposed/restricted amd64 Packages
     515.65.01-0ubuntu0.20.04.1 500
        500 https://mirrors.ustc.edu.cn/ubuntu focal-updates/restricted amd64 Packages
        500 https://mirrors.ustc.edu.cn/ubuntu focal-security/restricted amd64 Packages
        100 /var/lib/dpkg/status

@Manfred Hampl (m-hampl)

The information about the kernel that you are running is somewhat contradictory.

In the initial question you write about the 5.15.65-rt49 / 5.10.140-rt73 kernel, but now your output shows that you are running 5.15.0-48-generic. How does that fit together?

If you try installing nvidia-dkms-510 or nvidia-dkms-515 with the 5.15.0-48-generic kernel, does that work?

Additional remark: it is not advisable to have the focal-proposed repository bucket permanently enabled.

I mean now that the os kernel is 5.15.0-48-generic, a new rt kernel, such as 5.10.140-rt73, tried to be compiled from source code. At the compile stage, I meet a compile error, which says, ERROR (dkms apport): kernel package linux-headers-5.10.140-rt73 is not supported
Error! Bad return status for module build on kernel: 5.10.140-rt73 (x86_64). nvidia-dkms can be installed on current os (kernel 5.15.0-48-generic).

The message tells everything:

The kernel package linux-headers-5.10.140-rt73 is not supported by the NVidia software.

In my opinion this is a problem, for which NVidia is responsible and that cannot be changed by Ubuntu

For which purpose do you need a real-time kernel? I do not understand how that would fit to the need for a dedicated graphics driver.

A real-time kernel is required by robotics control software. It gets the error when building driver modules . I will post the question on nvidia forums.

For completeness' sake a link to the posting in the nvidia forum:
https://forums.developer.nvidia.com/t/nvidia-dkms-not-support-kernel-when-mannuly-compile-5-15-65-rt49-5-10-140-rt73-kernel/230528