OEM 5.6 kernel is now transited to 5.10 but pre-signed nvidia is not and cause no nvidia driver after oem kernel transition

If end user install nvidia driver using 20.04.2 stock image without connecting network and they will get the 5.6 oem kernel + 5.6 nvidia driver (linux-modules-nvidia-*).

After the installation, the user will get 5.10 kernel + nvidia pre-signed 5.6 driver after dist-upgrade.

It will cause there is no nvidia driver in the system.

Below shows the candidates packages:

# apt policy linux-oem-20.04
linux-oem-20.04:
  Installed: (none)
  Candidate: 5.10.0.1034.35
  Version table:
     5.10.0.1034.35 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     5.10.0.1033.34 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     5.6.0.1007.7 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

# apt policy linux-modules-nvidia-460-oem-20.04
linux-modules-nvidia-460-oem-20.04:
  Installed: (none)
  Candidate: 5.6.0-1056.60
  Version table:
     5.6.0-1056.60 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages