Trying to install on J3455B mobo, linuxcnc installation usb not bootable

Just like the title says, I'm trying to install any linuxcnc/ubuntu/mint iso I can find, but my motherboard won't recognize the usb installer media as bootable. Is there some trick to it? I tried using unetbootin, win32diskimager, the linux mint usb iso tool, and dd. None of them produced something that was bootable. I looked in gparted, and in all cases, the "boot" flag was not set for the usb media.

My other option is to install mint and build the RT kernel after the fact, but this little box is incredibly puny, and it seemed like it spent all the time compiling drivers and modules I'll never use (I gave up after 3 hours). Does anyone have experience with this particular motherboard? Am I stuck with trying to compile the kernel after the fact? Is there an easy way to compile the kernel on a brawnier computer and move it over to this box without having to deal with installation media?

Have you gone into the BIOS and set it to boot legacy Compatibility Support Module ?

Go through your manual or look for it online.

This is basically what I had to do on my J3355B

That's it enable CSM.

Or search for J3455B Legacy boot.

If you like Mint you may want to read through ALL of this thread, the latest Release is towards the end.
forum.linuxcnc.org/9-installing-linuxcnc...t-19-2-with-linuxcnc

Tried enabling anything in the bios labeled "legacy" and CSM. It boots the mint 19 installer usb just fine, I just can't get any of the installers that include linuxcnc to boot.

For DD, I tried:

sudo dd if=linuxmint-19.2.0-2020.02.18-rtai-lcnc-v28-mate-64bit.iso of=/dev/sdb oflag=direct bs=1048576

it copied, it's readable, but it's not bootable. I'll try the iso towards the end of that thread. What can you recommend for creating installation media? use DD, sure, but what parameters?

Ok if that one wont boot none of my other mate images will boot.

Hmmm for some reason you seem to have trouble booting hybrid iso's. I haven't tried booting those images on my board yet, as it is buried under some stuff in the cupboard I call a garage.

There is something that may work.
Basically it involves creating an exfat partition on the USB stick, installing grub to the USB stick and booting by "loop mounting the image". If you are interested I can post some instructions if you are interested.

Is there an option to enable USB legacy ?

Launch PXE OpROM Policy should be legacy
Launch Storage OpROM Policy should be legacy
Launch Video OpROM Policy should be legacy

I have also disabled the FAST BOOT option

Just tried the most recent RT image and it boots on my board.

Got it! Installing one of your mint ISOs now. Used Rufus, it detected some issue with mismatched versions of a particular component. I'll post a screenshot and more detailed info on my settings tomorrow, gonna install now and go to bed.

Thanks for your help! And thanks for rolling those ISOs.

Thanks for bringing this issue up. The software I was using to remaster the image was not creating a UEFI image. I fixed that and created a test image that booted in VBox when that was set for UEFI . I’ll upload the new RT image after your next post.
Once again thanks for the input it has been really helpful.

Cheers
Rob