Currently linux-modules-nvidia-460-generic is a transitional package:

~$ apt-cache show linux-modules-nvidia-460-generic
Package: linux-modules-nvidia-460-generic
Architecture: amd64
Version: 5.4.0-90.101+1
Priority: optional
Section: restricted/kernel
Source: linux-restricted-modules
Origin: Ubuntu
Maintainer: Canonical Kernel Team <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 23
Depends: linux-modules-nvidia-470-generic
Filename: pool/restricted/l/linux-restricted-modules/linux-modules-nvidia-460-generic_5.4.0-90.101+1_amd64.deb
Size: 5412
MD5sum: 760527c6278adb91d936a74ca1ad6b88
SHA1: 41d52c620d304c3915fb5047774120643d3f9692
SHA256: dfdb35bd5ca761a7edfb43ec6f0cdb43632a772556f750326094349be948ea97
SHA512: 8f43cb0a26679294f23b892780e69c2cb54f813d643081454f49ad6b5817e60c90a8c5a3656cf14e11c0beebbf1aa9790211567f58c45eeefb5ba1f03be19f86
Description: Extra drivers for nvidia-460 for the generic flavour (dummy transitional package)
Description-md5: 78765885d150cdb01c80468a2d3eaeb1


but nvidia-driver-460 not:

~$ apt-cache show nvidia-driver-460|grep -v aliases
Package: nvidia-driver-460
Architecture: amd64
Version: 460.91.03-0ubuntu0.20.04.1
Priority: optional
Section: restricted/libs
Source: nvidia-graphics-drivers-460
Origin: Ubuntu
Maintainer: Ubuntu Core Developers <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 1474
Depends: libnvidia-gl-460 (= 460.91.03-0ubuntu0.20.04.1), nvidia-dkms-460 (<= 460.91.03-1), nvidia-dkms-460 (>= 460.91.03), nvidia-kernel-common-460 (<= 460.91.03-1), nvidia-kernel-common-460 (>= 460.91.03), nvidia-kernel-source-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-compute-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-extra-460 (= 460.91.03-0ubuntu0.20.04.1), nvidia-compute-utils-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-decode-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-encode-460 (= 460.91.03-0ubuntu0.20.04.1), nvidia-utils-460 (= 460.91.03-0ubuntu0.20.04.1), xserver-xorg-video-nvidia-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-cfg1-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-ifr1-460 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-fbc1-460 (= 460.91.03-0ubuntu0.20.04.1)
Recommends: nvidia-settings, nvidia-prime (>= 0.8), libnvidia-compute-460:i386 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-decode-460:i386 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-encode-460:i386 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-ifr1-460:i386 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-fbc1-460:i386 (= 460.91.03-0ubuntu0.20.04.1), libnvidia-gl-460:i386 (= 460.91.03-0ubuntu0.20.04.1)
Filename: pool/restricted/n/nvidia-graphics-drivers-460/nvidia-driver-460_460.91.03-0ubuntu0.20.04.1_amd64.deb
Size: 434356
MD5sum: 583a88a6809e0ed5a0de745c468cdf84
SHA1: 8224f6ff980359fa07a9791e3fa28d5ee42516bd
SHA256: 50dea4ead5865942774a633dbe2dbfb50925bbced82be2ed0ccc7a10b3c3bed1
SHA512: 6e54616dd0e27efa5220ad10bb63d1dc48b50fa52b108b11593b8cc699ac81672288a287f6ed216193f47bacc450f1ed2ecd64e96763b77105418fa280938834
Homepage: http://www.nvidia.com
Description: NVIDIA driver metapackage
Description-md5: bebab1fe5187fb321ade7781f5858b86
Support: LTSB

as result we have a broken system after upgrade