The faster and more powerful Raspberry Pi 2 makes it possible to run more and different operating systems than with earlier versions. Here is my first-hand experience loading and running Ubuntu MATE on the Pi.
When the original Raspberry Pi came out, some people had high hopes for it as a low-cost general-purpose desktop computer. Especially because it was running Raspbian (a derivative of Debian GNU/Linux) it seemed like a good prospect. Although it booted to a CLI text console, it also included the LXDE desktop and you could easily configure it to boot to the GUI rather than the CLI. It seemed pretty promising.
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