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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