Can't install Virtualbox guest

[Norbert]

Steps to reproduce:
1. Have Ubuntu 20.04 LTS installed inside virtualbox
2. Try to install virtualbox additions using ubuntu-drivers as follows

    sudo ubuntu-drivers install
    sudo ubuntu-drivers autoinstall

Expected results:
* installed normally

Actual results:
* does not install with errors:

```
$ sudo ubuntu-drivers install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 virtualbox-guest-dkms-hwe : Conflicts: virtualbox-guest-dkms
 virtualbox-guest-x11 : Depends: virtualbox-guest-utils (= 6.1.26-dfsg-3~ubuntu1.20.04.2)
 virtualbox-guest-x11-hwe : Conflicts: virtualbox-guest-x11
E: Unable to correct problems, you have held broken packages.

$ sudo ubuntu-drivers autoinstall
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 virtualbox-guest-dkms-hwe : Conflicts: virtualbox-guest-dkms
 virtualbox-guest-x11 : Depends: virtualbox-guest-utils (= 6.1.26-dfsg-3~ubuntu1.20.04.2)
 virtualbox-guest-x11-hwe : Conflicts: virtualbox-guest-x11
E: Unable to correct problems, you have held broken packages.

```

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-drivers-common 1:0.9.0~0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-90.101-generic 5.4.148
Uname: Linux 5.4.0-90-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Fri Nov 26 18:39:44 2021
InstallationDate: Installed on 2020-04-23 (581 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: ubuntu-drivers-common
UpgradeStatus: No upgrade log present (probably fresh install)