On Thu, May 19, 2016 at 03:19:24PM +0200, Pierre Ynard wrote: > Is that kind of downgrade supposed to be supported?
No, it is not supposed to be supported. > I encountered configuration migration problems for apt and postfix, > shall I file bugs for these? Probably not. This is a seldom used feature which may or may not work. For this to be supported, we would probably need a high number of people doing it as a "normal thing", because implementing a feature for only 0,001% of people is usually not a good idea. However, if a great number of people felt the need to downgrade their systems this way, that would mean that either we completely failed at writing the release notes, or we completely failed at making a stable release, in which case supporting downgrades would probably be the lesser of our problems.