Ah, thanks, I was told to report this bug in IRC.
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https://bugs.launchpad.net/bugs/1721484
Title:
virtualbox-guest-x11: Depends on xorg-server-core which cannot be
installed
To
Public bug reported:
The package virtualbox-guest-x11 depends on xorg-server-core, but Ubuntu
16.04.3 has xorg-server-core-hwe installed.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: virtualbox-guest-x11 (not installed)
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17