After some more thinking "<<first-version-in-this-release" is probably the safest. The upgrade path Trusty->Wily and Trusty->Xenial need that relation anyway - which means we should be able to rely on it.
After some more thinking "<<first- version- in-this- release" is probably the safest.
The upgrade path Trusty->Wily and Trusty->Xenial need that relation anyway - which means we should be able to rely on it.