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Some modules are not there even though they are listed in the config e.g. vrf. This happend in the official focal cloud image.
# ip link add red type vrf table 1
Error: Unknown device type.
# modprobe vrf
modprobe: FATAL: Module vrf not found in directory /lib/modules/5.4.0-48-generic
# grep VRF /boot/config-5.4.0-*
/boot/config-5.4.0-48-generic:CONFIG_NET_VRF=m
# uname -r
5.4.0-48-generic
In this case linux-modules-extra-5.4.0-48-generic is missing. To get the extra-modules for kernel updates you must install linux-image-generic, while in VMs only linux-image-virtual is installed.
apt install linux-image-generic
Package: linux-image-generic
Version: 5.4.0.65.68
Priority: optional
Section: kernel
Source: linux-meta
Origin: Ubuntu
Maintainer: Ubuntu Kernel Team <kernel-team@lists.ubuntu.com>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 18.4 kB
Provides: virtualbox-guest-modules (= 6.1.10-dfsg-1~ubuntu1.20.04.1), wireguard-modules (= 1.0.20201112-1~20.04.1), zfs-modules (= 0.8.3-1ubuntu12.5)
Depends: linux-image-5.4.0-65-generic, linux-modules-extra-5.4.0-65-generic, linux-firmware, intel-microcode, amd64-microcode
Recommends: thermald
Download-Size: 2620 B
APT-Manual-Installed: no
APT-Sources: http://es1.clouds.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
Description: Generic Linux kernel image
This package will always depend on the latest generic kernel image
available.
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