If you are running an i486 CPU, you will want to read this. 

https://itsfoss.com/news/linux-kernel-i486-cpu-support-removal/

#linux

The Linux Kernel is Finally Letting Go of i486 CPU Support

The support remained in the Linux kernel all these years after every other major platform dropped it.

It's FOSS

@itsfoss In the worst case, I think some BSD flavours are still supporting it in a way or another; at least nominally NetBSD has it as minimal requirement.
NetBSD even support Amiga48k...!

https://www.netbsd.org/ports/i386/hardware.html

NetBSD/i386 Supported Hardware

@raster @itsfoss LTS versions of Linux will keep supporting it for a few years.