This used to be good when I was new to ubuntu, about 3 years ago.
But then things changed. Ubuntu switched to unity, which is not the best desktop environment around. The developers stoped caring about stability. Its buggy now :\
Ubuntu seems to be a stable and useful Linux system. Ubuntu development is active and bugs are quickly fixed. Many Linux developers support Ubuntu. Ubuntu is also very secure. I have used Ubuntu ever since version 10.10. The Unity interface makes Ubuntu a sleek-looking operating system.