nvidia-kernel-source-460 460.91.03-0ubuntu0.20.04.1: nvidia kernel module failed to build

[Markus]

Crash dialog show up on reboot right after kernel update + reinstalling using:

apt purge nvidia-driver-460 # enforce a fresh install
apt install nvidia-driver-460

Besides the crash dialog, I did not notice any problems so far; e.g. no visual impact, nvidia utils launch as usual showing information, etc...

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ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: nvidia-kernel-source-460 460.91.03-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.8.0-63.71~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-63-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
DKMSKernelVersion: 5.8.0-59-generic
Date: Wed Jul 21 08:14:54 2021
Dependencies:

DuplicateSignature: dkms:nvidia-kernel-source-460:460.91.03-0ubuntu0.20.04.1:clang: error: unsupported option '-dumpspecs'
InstallationDate: Installed on 2021-05-27 (55 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
PackageVersion: 460.91.03-0ubuntu0.20.04.1
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.6
SourcePackage: nvidia-graphics-drivers-460
Title: nvidia-kernel-source-460 460.91.03-0ubuntu0.20.04.1: nvidia kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.