Ubuntu's popularity often makes it the default choice for new Linux users. But there are tons of other Linux operating systems that deserve your attention. As such, I've highlighted some Ubuntu alternatives so you can choose based on your needs and requirements—because conformity is boring.
There were lots of distros that tried to target regular users before it. Mandrake/Conectiva/Mandriva, Corel, Mepis, Lindows, Linspire etc. just off the top of my head.
Hell, Lindows came preinstalled on Walmart PCs at some point.
…Except Debian wasn't even user-friendly when I used it two years after Ubuntu's release. Red Hat Linux (not RHEL, which came later) was the only distro I'm aware of before Ubuntu that was more UX-focused.
Edit: I forgot about a few others — SUSE, Corel Linux, Lindows/Linspire, and others. Buuuuuuut most of those distros don't exist anymore. I still stand by that Debian didn't used to be as noob-friendly as it is these days.
What Linux distribution came before Ubuntu that was specifically designed to be user friendly for a non-technical user?
There were a bunch of distros advertising ease of use; several were even sold in physical boxes (which was the style at the time) and marketed to consumers at retail stores like BestBuy years before Ubuntu started.
Here are four pictures of the physical packaging for three of those pre-ubuntu desktop distros designed to be user friendly and marketed to the general public:
Ubuntu was better than what came before it in many ways, and it deserves credit for advancing desktop Linux adoption both then and now, but it was not "one of the first" by any stretch.