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Ok I get it now, Grad. You were just being human. All's good

I just remember lots of discussion around build your own last fall and went off some of the instructions in there... either which way, its a "home brew" and I'll give the official image a go.

As you might have guessed already I just downloaded the wrong file. Now you can say that you pointed me on that with your last comment. But since my linux knowledge is limited (told you so) I just needed you to tell me again to realize my mistake
Anyways it runs just fine now - thx for your help

What you were trying to boot a RPi5 with a amd64 image ?

Of course I provided the RPi5 checksum, why wouldn't I, this is a thread for the RPi5. The checksum will only work when used against a file, not a mounted file system, the checksum is for the compressed image file.

Am I missing something here ?

Thank you for your help, please notice my linux knowledge is limited so my answers may sound stupid . Anyways
cat /proc/device-tree/compatible | tr '\0' '\n'
returned:
raspberrypi, 5-model-b
brcm, bcm2712

The checksum did not match, but the link you provided is for rpi-5-debian-bookworm - I used the linuxcnc_2.9.4-amd64.hybrid.iso

Anyways, I mounted Linuxcnc image under Ubuntu and all the checksums there matched when i used
sha256sum -c sha256sum.txt

None of the Linuxcnc images and ISOs install a root user so sudo is required
Sometimes I do: sudo su
which gives you a root access (you will see the prompt change) untill you type: exit