I'm pretty confidendent in saying that I've had Windows, OSX, Debian, Red Hat, Fedora and Ubuntu release upgrades all result in some kind of breakage that has t

I'm pretty confidendent in saying that I've had Windows, OSX, Debian, Red Hat, Fedora and Ubuntu release upgrades all result in some kind of breakage that has taken time to fix. I think the only platforms I've not had comparable levels of breakage with are FreeBSD and Solaris, but then I only ever did one upgrade in both cases, so maybe I just got lucky. It's great if you've never had problems, I feel envy for you, but some small % of users will have problems due to the sheer number of different hardware and software configurations out there. Hell, I haven't even managed a single upgrade of OpenWRT without losing a bunch of additional configuration / packages.