current latest download of LinuxCNC V2.9.8 will not install GRUB on several PC's

I downloaded the 2.9.8 latest version from the first link in the download page
Burned this iso to a pen drive under windows using Rufus latest version
Live preview works fine
Graphic install consistently fails at the point of installing GRUB
         - this happened on numerous older PC typically inter dual core with 4GB to 8GB of RAM and installing to an SSD
As a trial I installed 2.7.4 which I had on a pen drive without issue

It should be noted the 2.9.8 installed perfectly onto a much newer NUC PC using the same pen drive

I have installed 2.9.7 without any issues and will (Debian 13) and will look to update to 2.9.8 tomorrow when time allows

Please advise if any more info is required
Regards,  Paul

As Tommy alludes to Grub errors are usually because you have secure boot enabled. Turn that off in the BIOS. Trixie is batter with secure boot but still better to disable it.

Secure boot is already turned off
I’ll take a look for CSM (assumed to be ‘compatibility support module’)

I didn’t spot it in the bios but equally wasn’t looking for it. Is it normally in the same area of the bios screen that legacy mode and secure boot reside ?


Thanks for the help so far
Cheers. Paul

Thanks Rod
See my reply above to Tommy
Secure boot was already turned off
Machine for context is a Dell anal form factor vintage 2014
Intel dual core 8gb ram
Selected as it gives really low max jitter numbers

Cheers. Paul

Tommy / Rod
Also worth remembering that I downloaded the previous latest version 2.9.7 which is also on Debian 13, burned the iso to a pen drive (all be it a different pen drive) using the same version of Rufus with all the same settings and that installed GRUB perfectly