This is not the case for Ubuntu -- it's always supported upgrading from one release to the next, and that is the normal and expected thing to do. The same is t

This is not the case for Ubuntu -- it's always supported upgrading from one release to the next, and that is the normal and expected thing to do. The same is true for Debian, Fedora, and... well, every Linux distro I've ever known people using on their desktops/laptops. For good reason, because it is a pretty essential feature in that context.