Comment 6 for bug 1183916

I think autopkgtest is working as designed. Since run-adt-test uses the adt-virt-null driver, and the adt-virt-null driver doesn't support the "revert" virt driver capability, build dependencies do not get cleaned up. To fix this, run-adt-test should use a proper virt driver that supports "revert" and "revert-full-system".

Cleaning up build dependencies when using virt drivers that do support "revert-full-system" will just waste time, though I don't see it doing any harm. So I'm neutral on Adam's approach, although I think it's just a workaround for problem caused by the consequence of using adt-virt-null in production.