Clipboard and drag-and-drop do not work with virtualbox-guest-x11-hwe on 16.04 LTS

[Norbert]

Steps to reproduce:
1. Have Ubuntu 16.04.6 LTS installed as guest for VirtualBox 5.1.38 host.
2. Install full HWE to Ubuntu
3. Install `virtualbox-guest-x11-hwe` package
4. Setup *Shared Clipboard* and *Drag and Drop* as *Bidirectional* for both guest and host

Expected results:
* both *Shared Clipboard* and *Drag and Drop* work

Actual results:
* both *Shared Clipboard* and *Drag and Drop* do not work

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: virtualbox-guest-x11-hwe 5.1.38-dfsg-0ubuntu1.16.04.2
ProcVersionSignature: Ubuntu 4.15.0-46.49~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-46-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: MATE
Date: Sat Mar 23 20:21:05 2019
InstallationDate: Installed on 2018-08-07 (228 days ago)
InstallationMedia: Ubuntu-MATE 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
SourcePackage: virtualbox-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[Gianfranco Costamagna (costamagnagianfranco)]

does the virtualbox-guest-additions-iso package work?

[Launchpad Janitor (janitor)]

[Expired for virtualbox-hwe (Ubuntu) because there has been no activity for 60 days.]