Commodore64 for first OS, taught myself to type and then taught myself BASIC on that beast.

I honestly do not know what my first Linus distro was, whatever was on the machines in the CS half of the computer lab in college. First one I installed myself was Ubuntu, but I abandoned it almost immediately in favor of another distro that I also don't remember.

Well, this sets a new level of recent here judging by the comments.

Desktop OS: Linux Mint 20 MATE. Yep, that's right. I only got my first proper computer in 2020.
Thankfully, I had to install the OS myself, which was of course preceded by choosing an OS.
I had Windows 10 on that laptop for 2 days which served me to compare different OSs and burn the install DVD. I had no flash drives, and just dug out one old DVD-RW. OK, I'll be honest, hearing about Linux first I was searching for "just Linux", pure Linux, not derivatives. Oh well, GNU+Linux copypasta actually being helpful.

Alright, but why did I "have" to install an OS if I got it with Windows? It was used. I did reset it, but even though it was my first proper PC, I had no lack of paranoia. I thought that someone before me could have put spyware on that.
And I was right. Not the way I thought, but I was. That someone was Microsoft.

First social media post that's ever made me feel young! Earliest I remember was Windows 95, but I didn't do much besides play with MS Paint.

C64 Basic, Yggdrasil Linux. I wanted to install Minix, in the pre-Linux times, but it was beyond my abilities

My first OS was DOS 5.0, I switched to linux with Fedora core 6

Atari 800 basic.

Gentoo was the first distro I used for any significant amount of time (college).

My first OS was Windows 98.

Linux distro was Ubuntu 6.0.

I had a Debian PC for a while, it was more of a project. IT work still revolved around Windows back then. Later I discovered Puppy Linux and ran that on a live USB. I encrypted the hard drive in my work laptop and never had to worry about anything making from the USB to my work data. Not a bad way to live, only had to carry around one laptop when I traveled for work.

Windows → Mint → Windows → Void → NixOS

It was a Lisa. Those were good times.

First OS - DOS 5.0 First Linux - Knoppix

First OS: MS-DOS 5

First Linux (many years later): Yellow Dog on one of those dome-shaped iMacs with the PPC chips

First linux distro was Ubuntu but I used it in VM but the actual daily driver was Archlinux. I think Windows XP was the first OS which i used on computer(In home sure but in school maybe it was Windows 97?)

Macintosh System 7. Then I moved to Windows 98, which was the style at the time.

CP/M on a Kaypro II. My uncle was a contractor for the US air force. Even had a modem - a wooden box he built to hold a telephone handset.

Fun times.

First OS for me would be Windows XP.

First Linux I've tried using could technically be whatever version of Android was on my mom's Droid phone.

First desktop Linux would be some version of Ubuntu around 2014-2015

Commodore ROM BASIC; 1980

First operating system was probably either Windows 98 or Windows 2000. First Linux operating system was Ubuntu 10.10.

The first one I remember using was good old Windows 98.

School: if it wasn’t a Macintosh Plus it was something like it. We were given very little time with it and had to go to a special computer room to use them so I don’t remember a lot of specifics about it, beyond the school tech guy having to painstakingly load each program we wanted to use manually from a floppy

Home: Windows 3.1. I don’t think we got the internet until Windows 95, though

Zx spectrum --> msx-dos --> ms-dos --dr-dos --> win95 --> Suse (before it was bought by novell) --> win98 --> debian

First os was whatever was on a apple II. First linux was fedora. I spent 9 years using various red hat disteos as my main work machine.

Gaming kept me on windows at home. Now that proton let's me game i've been running mint debian for over a year and loving it.

My wife uses arch btw.

Slackware 1.0, dann S.u.S.E

Windows '95. My mom didn't know the concept of backwards incompatibility and got it second hand in 2001. It was hard to find something that would run on it beyond Doom.

Windows 7 -> Windows 10 -> Kubuntu -> Linux Mint -> Nobara -> Pop!_OS -> OpenSUSE TumbleWeed -> EndeavourOS

Reading the comments I want to say I feel old (25y) but compared to others I feel like a gen alpha

I came late in the tech world. I started with Windows XP

And my first distro was Ubuntu 10.10 till Ubuntu 17.10. Now I just hop from distro to distro. Right now using Pop!_OS for a year now.

First time --> Basic (???)(Amstrad CPC464) --> MS DOS Windows --> 3.11 (yes, 3.11)-> W95 -> W98 -> Win Me -> Win XP -> Win 7 -> Win 10 (only for some games) GNU/Linux --> (2013) Mint -> Debian ->Manjaro (2-3 days) -> POPos (2-3 days) -> Mint -> Nobara --> Fedora (last Year)

Windows XP on a laptop. Then Windows 7 on a new laptop. After that, Windows 10 and Windows 11 on desktop and another new laptop.

Tried Debian on my laptop. Later, switched completely to Linux Mint on desktop. Distro-hopped to Kubuntu (KDE Plasma). Wanted to get Plasma 6 immediately after release, so I installed EndeavourOS on my desktop and laptop.

Now switched to pure Arch Linux on my desktop PC, didn't boot Windows on any of my private PCs for months (no dual boot, only GPU passthrough VM).

Apple ProDOS yo! Then System 6 and on.

First Linux was a Debian disto packaged with Linux for Dummies somewhere in the late 90s/early 00s.

My first OS was whatever ran on a Commodore 64. I guess the Commodore kernel and Basic?

My first distro was whatever version of Fedora was current in the fall of 2008. I'd gone to university that year and my laptop crapped out. Couldn't afford a legit Windows license at the time to replace it, and I'm pretty sure I just remembered that Red Hat was a thing and found Fedora that way. One thumb drive and 16 years later, still using linux, so I guess that was about the only good thing to come from my abortive first attempt at higher education.

DR-DOS

Mac OS 7. By the mid-2000s, I adopted Arch Linux after looking into some other Linux distributions.

On my first PC it was DOS 2.0, but before that I had a Vic-20, then a Commodore 64.

Apple DOS Edit: Apple ProDOS
First Linux, I'm not sure anymore. Whatever was prevalent in the mid 2000s.

Windows XP, but it was during its ending phase, so I think it really was Vista. My first Linux distro was Kali Linux because I wanted to be a cool hacker when I was a kid. I never got too much into it then, though. I then found Ubuntu, and strangely enough, I switched to Trisquel, which wasn't too bad. I decided to go all the way and buy a T400 with Libreboot/Trisquel when I was about 15 years old and used that as my second computer for about two years. I learned how to start installing Libreboot myself. It was a really fun experience (not really, there was a lot of quitting and crying), but it taught me more about GNU and the entire philosophy. I started to learn more about GNU and RMS when I was 18. Now I'm 20 and use Arch. The end.

First OS on a computer I personally owned? Windows 98. First Linux distro was Source Mage.

If not counting ownership, then Apple IIs at school and then slightly later my family got an Amstrad that was primarily a DOS machine, but could also boot (by switching floppies several times) to some sort of GUI.

DOS - Win3.1 - Win95/98 - BeOS - Red Hat Linux - WinXP - Mac OS X - WinVista/7/8 - MacOS X - Win10 - Debian Linux (and staying with it).

On the Linux side: Crunchbang Linux when it was running Debian

I tried Microsoft Windows & Apple OS X before that, but that is is now behind me… as is Debian & Arch being a NixOS user for the last few years.

First OS windows 95 First linux distro ubuntu Currently manjaro, windows 11, macos

Windows 98. Later the first Linux distro I tried was Mandrake Linux but I didn't really get into it until later with Crunchbang.

First OS, WinXP.

Later when win7 was discontinued, I kept windows 10 on my desktop and Ubuntu on my laptop. It wasnt until Valve started working on proton and most of the games I play became playable on Linux that I ditched windows entirely.

I distrohopped around for a while, but always found myself landing back on Ubuntu, so it's what I've stuck with to this day, although if anyone else asks me what distro they should get, I will usually recommend mint.

Microsoft Extended BASIC