And yes, my second problem vboxvideo.ko is not a regression from the
status quo; the old package *always* turns on the libGL redirection,
which breaks everybody that's not virtualbox with 3d accel enabled and
working. The proposed fix only turns it on if VBoxClient --check3d
returns success, which avoids conflicting with VMware, real PCs,
VirtualBox with 3d acceleration disabled, etc.

There's still an issue if you're on virtualbox, have 3d acceleration
turned on, but are missing the kernel driver for it to actually work. In
that case VBoxClient --check3d succeeds, the libGL redirection is
enabled, but it doesn't actually work. But anyone in that situation is
also broken with today's unconditionally-enabled package (and has a
proper fix; either turn off the configuration for 3d accel if they
didn't intend to use it, or install the kernel driver using virtualbox-
guest-dkms so that it does work).

So the current package in the queue seems good to merge as-is. It fixes
most broken configurations, doesn't break any that were currently
working, and the remaining problem seems like an independent upstream
bug.

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https://bugs.launchpad.net/bugs/1762491

Title:
  [SRU] No graphics after update, caused by virtualbox

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