In general if you run with kernel from e.g.
  linux-image-kvm (= 5.4.0.1023.21)
then you'll need
  linux-modules-5.4.0-1023-kvm

But as I said the whole purpose of the -kvm kernels is to have a reduced 
configuration.
So even "linux-modules-5.4.0-1023-kvm" won't contain the module you need.

Instead you'll have to use the -generic kernel which would be:
linux-image-<version>-generic + linux-modules-<version>-generic

The usual install of
$ apt install linux-generic

Should bring in both, if you then boot into the -generic kernel the
module will be available and load just fine.

IMHO just do this in the guest:
$ apt remove 'linux-*-kvm'
$ apt install linux-generic
$ reboot

That should get you going.

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https://bugs.launchpad.net/bugs/1892422

Title:
  Pci passthrough interface not showing up in Ubuntu 20.04 but does show
  in 18.04

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