Gnu/linux as what it's officially called (since Linux is just the kernel!), the distribution I use is Mint (not version 21 due to issues also plaguing Ubuntu), which is based on Ubuntu. It's my go-to operating system on all machines.
Also have debian edition (also Mint) on a DVR laptop (DIY 'ring' camera setup using motion and VLC).
Windows 10 (6.5.8) is installed on a second physical disk on my 2009-era desktop (yeah, that's OLD! by today's standards), however it runs linux mint all the time.
The Windows disk has failed in the past (head-crash, no doubt), so a clean install was just another step. Nothing of value lost.