Ubuntu is Linux for Human Beings - the programs you use are designed around you, the person using them, and are not made any more complex than is absolutely necessary. This does not mean that Ubuntu lacks power, though - the Ubuntu desktop is full of innovative features which other operating systems are only just starting to think about using.
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Messages are worded in an unconfusing way, so you only need to read them once.
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Your programs are arranged in a way which makes them easy to find.
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Programs tend to be uncluttered and streamlined, focusing on the tasks you want to achieve.