Upgrading DGX OS on a DGX Station

Hi folks, I’m facing issues trying to upgrade the DGX OS from 4.1.0 to 5+. When I try to run sudo nvidia-release-upgrade --force it tells me

$ sudo nvidia-release-upgrade --force

WARNING: The following packages are installed, but have no 20.04 upgrade path.
They will be uninstalled during the release upgrade process.

    libcudnn7 libcudnn7-dev libcudnn7-doc

'restricted' distribution component is already enabled for all sources.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libc6:i386 is already the newest version (2.27-3ubuntu1.5).
The following packages were automatically installed and are no longer required:
  libnvidia-gl-430 libnvidia-gl-440 libnvidia-gl-450
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 40 not upgraded.
Package: *
Pin: release l=Base OS Repository
Pin-Priority: 600

Package: *
Pin: release l=Base OS Updates Repository
Pin-Priority: 600

Package: *
Pin: release l=NVIDIA CUDA
Pin-Priority: 580

Package: cuda-drivers
Pin: release l=NVIDIA CUDA
Pin-Priority: -1

Package: nsight-compute
Pin: origin *ubuntu.com*
Pin-Priority: -1

Package: nsight-systems
Pin: origin *ubuntu.com*
Pin-Priority: -1

Package: nvidia-fabricmanager-*
Pin: origin *ubuntu.com*
Pin-Priority: 600

Package: libnvidia-nscq-*
Pin: origin *ubuntu.com*
Pin-Priority: 600
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

The thing is, I have already done sudo apt update and sudo apt -y full-upgrade .

I guess this because of ‘40 not upgraded.’ and investigate.

For example, dgx-plymouth is depended on nvidia-plymouth,
and nvidia-plymouth is depended on plymouth-theme-spinner.

But plymouth-theme-spinner seems to be not provided for Ubuntu18.04 no more.

What should I do?
Can I delete ‘not upgraded packages’ and install after upgrade?

Some help on this would be great! Thanks a lot.

I deleted ‘not upgraded packages’ and I could execute ‘sudo nvidia-release-upgrade --force’.
But when I reinstall ‘not upgraded packages’ , window system did’nt launched.
and then I installed nvidia drivers by reference below, Ubuntu window system could launched!
DGX OS 5 User Guide :: DGX Systems Documentation (nvidia.com)

Any way ,my problem was resolved(maybe).thanks.

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