For ages people complained that when they installed Linux they just couldn't get it to do the things they wanted it to do. People would ask how do they get this stuff to be useful and geeks would throw shell commands and bash scripts at them and expect your average end user to be happy with that. Ubuntu cast a shining light on the need to remove this kind of micro-management from the usual day to day. And they made it so.
Other distros now also contain the little niceties here and there as well, but I think the underlying infrastructure for a users apps is provided in the most pleasing way via Ubuntu/Kubuntu.