Comment 1 for bug 1873506

This problem can be worked around with the vagrant-vbguest plugin and VirtualBox 6.0.20 r137117 (Qt5.6.3). With VirtualBox 6.0.6 the plugin was not able to fix it because the guest additions would not compile for the included kernel. This does make the start-up time much slower because they are found to be missing and compiled on the fly during `vagrant up`.