Ubuntu 14.04, I was probably about ten years old at the time. My father had installed it on what I believe was a Dell Inspiron 1526. Good times were had with Unity. I vaguely remember downloading Umit (i think that's what it was, it has that pill logo), not knowing what it did, and running it on my father's work's website, leading to our home internet being blocked from connecting to it.

Dang, I miss using Unity.