Install virtualbox from our custom APT repository (refs: #15621)
As per https://labs.riseup.net/code/issues/12048#note-12: "we'll ship virtualbox-guest-x11 from sid as long as it's installable on Stretch; then we'll import the last working version in our custom APT repo. And if/when that last working version breaks (e.g. because we get a new xorg from stretch-backports and the virtualbox driver doesn't build against it anymore, there's no ABI compatibility between major X.Org versions, all drivers need to be rebuilt against the new one; it's happened a few times already that whatever virtualbox backport we were shipping wasn't compatible with the xorg from backports, etc.), then we'll reconsider and possibly drop VirtualBox support."
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