I've experienced the same issue with the same combination of host/guest.
I've tried multiple versions of Virtualbox for Windows. Blank screen
after after starting X after taking the latest Ubuntu 16.04 updates on
Tuesday, 3/28/2018.
This update replaced virtualbox-guest* 5.0.40 with 5.1.34-dfsg-0ubuntu1.16.04.2:
Unpacking virtualbox-guest-x11 (5.1.34-dfsg-0ubuntu1.16.04.2) over
(5.0.40-dfsg-0ubuntu1.16.04.2) ...
host: Windows 10 Enterprise
Virtualbox 5.1.28, 5.1.34, and 5.2.8 (tried each version)
guest: Kubuntu 16.04
virtualbox-guest-x11 5.1.34-dfsg-0ubuntu1.16.04.2
sddm 0.13.0-1ubuntu5
I've already reproduced the same blank screen behavior with a fresh
Kubuntu 16.04 install into a fresh virtual machine.
I've found the following things produce improved behavior:
1) uninstalling virtualbox-guest-x11. Not desirable from a functionality
perspective, but it does produce working video for both the X display
manager and KDE.
2) using xdm instead of sddm as /etc/X11/default-display-manager. Now,
with the guest-x11 pkg installed, there's working video in the login
screen from xdm, although kde plasma still produces a blank screen.
3) uninstalling virtualbox-guest-x11, installing VBoxLinuxAdditions.run
5.2.8 included in the Virtualbox 5.2.8 installation. Works great with
the three vbox modules installed.
4) exporting/importing to VMware Player.
So it would appear it's an issue with the virtualbox-guest-x11 5.1.34
-dfsg-0ubuntu1.16.04.2 package that was made available recently in the
Ubuntu 16.04 updates repo.
Regards,
Dan
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https://bugs.launchpad.net/bugs/1759452
Title:
KDE won't display after updating
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