I have a box with Ubuntu. Every time I boot it there are about 50 updates waiting to load. Does that happen to you too?
It depends on what software you have loaded on to the system, but yes, there are frequently new updates. I like it because I know that my system is up-to-date all of the time. It's a much better model than the "Patch Tuesday" (once a month) system that Microsoft uses for its major updates.