This isn't a bug in software-properties.  What I can't decide is if it's
a bug in virtualbox-guest* or ubuntu-drivers-common.  Basically, here's
what's happening:

1) The virtualbox-guest* packages have a modalias for the "guest services", but 
not the VGA controller.
2) We pulled the DKMS drivers into the kernel.
3) The above situation confuses ubuntu-drivers-common, which really wants to 
install vbox-dkms, but we have it builtin.
4) Nothing wants to install vbox-x11, which we actually want.

So, the lack of modaliases on vbox-x11 is definitely a vbox bug, and the
dependencies are also a bit strong between vbox packages (we should drop
some recommends to suggests, to stop trying to forcefully install
compilers to get an X driver).

That said, we might also want to quirk the ubuntu-drivers-common
detection a bit to either hide vbox-dkms altogether, or actually let us
use it if it's a potential upgrade.  Currently, neither of these options
is in play, and we see it, but it's greyed out, which is amazingly
confusing.

** Package changed: software-properties (Ubuntu) => ubuntu-drivers-
common (Ubuntu)

** Also affects: virtualbox (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: virtualbox (Ubuntu)
   Importance: Undecided => High

** Changed in: virtualbox (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1434579

Title:
  Unable to install VirtualBox Guest Service in 15.04

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