Ubuntu 9.04, because of WUBI (anyone remember that?). Unstable as hell, but allowed you to run a near bare metal Linux install without the hassle of setting up dual-booting and a separate partition. Liked Ubuntu it so much that I soon replaced Windows completely. Currently running Debian, so I haven’t strayed far from the family.
On Mastodon, too. Some of my more niche interests are better represented there since Mastodon has more active users than Lemmy.