nvidia-dkms-450 450.80.02-0ubuntu0.20.04.2: nvidia kernel module failed to build

new DELL computer (pre-configured by DELL) with ubuntu 20.04 istalled by DELL. started working with this machine since 4 days ONLY

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: nvidia-dkms-450 450.80.02-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.10.0-1038.40-oem 5.10.46
Uname: Linux 5.10.0-1038-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
DKMSKernelVersion: 5.10.0-1038-oem
Date: Wed Jul 21 10:49:29 2021
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-focal-amd64-20200502-85
DuplicateSignature: dkms:nvidia-dkms-450:450.80.02-0ubuntu0.20.04.2:/var/lib/dkms/nvidia/450.80.02/build/nvidia/nv-dma.c:600:37: error: implicit declaration of function ‘get_dma_ops’ [-Werror=implicit-function-declaration]
InstallationDate: Installed on 2021-06-27 (25 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
PackageVersion: 450.80.02-0ubuntu0.20.04.2
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.2
SourcePackage: nvidia-graphics-drivers-450
Title: nvidia-dkms-450 450.80.02-0ubuntu0.20.04.2: nvidia kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)