Comment by clhodapp

Agree to disagree, I guess.

I've found three "hotspots" that break Ubuntu at a pretty high rate of incidence: 1) Upgrading to the next distro release 2) Installing or updating Nvidia drivers using the built-in management tool 3) Changing to a different kernel "series" (such as switching to a hardware enablement kernel)

In all these cases, I've found that the process stands a solid (hand-waving: 20%) chance of stopping in the middle, requiring manual resolution of broken packages.