Comment 4 for bug 200380

I've just uploaded virtualbox-ose-modules 16, which uses "Provides: virtualbox-ose-modules" for each of the real packages.
This appears to allow installing them side by side, although they are overwriting files of each other.
However, this is not a real fix, because when you install the package, which "holds" the init script, the init script gets removed. The fix for this (missing init script) is then to reinstall one of the packages which are still in use (and also ship the init script).

As said above, I will try getting the latest virtualbox-ose package from Debian in, which provides the module loading functionality in its init script, so that the -modules packages basically only ship the .ko files (but not any init scripts).