Patches? Ok, this is something I was not aware of and can potentially be a problem. Where do those patches come from? I don't see them on the zesty version of modemmanager, same for the one we have in bionic. SRUs have rather strict requirements, one of which being that later series cannot revert functionality for packages, enforcing that any change - if applicable - needs to first be present in the development series (and at best any other upgrade path from the given upload).
Why were those changes only in the snap version of modemmanager? Are those unacceptable for general Ubuntu/Debian usage? Are those only valid for xenial? If there are no good reasons for those, we'd have to first get those into bionic (or, at best, Debian even) and only then thing about backporting that into the stable series.
Patches? Ok, this is something I was not aware of and can potentially be a problem. Where do those patches come from? I don't see them on the zesty version of modemmanager, same for the one we have in bionic. SRUs have rather strict requirements, one of which being that later series cannot revert functionality for packages, enforcing that any change - if applicable - needs to first be present in the development series (and at best any other upgrade path from the given upload).
Why were those changes only in the snap version of modemmanager? Are those unacceptable for general Ubuntu/Debian usage? Are those only valid for xenial? If there are no good reasons for those, we'd have to first get those into bionic (or, at best, Debian even) and only then thing about backporting that into the stable series.