LinuxCNC Installation from USB troubles

I've tried to write to the USB in every way I can think of, and that consists of: writing from terminal, using Rufus/WindowsLiveBoot/Unetbootin/W32Disk imager. I'm running into issues across the board here. Once the USB is made into a bootable drive, it no longer shows up in the boot menu options. Prior to the loading of the drive it showed right up. No matter which way I load the drive it does this. I've tried two different USB sticks. When the drive is loaded as such, on the actual OS selecting setup.exe fails. I'm at a complete loss as to why this is ending up so tedious. What else can I do?
I've got 16.04.4 (mainly because it was one that popped up on ubuntu's website). Any tips?

What has been the exact instruction you have issued at the terminal to write to USB ?

From memory many of the Windows USB writers fail with Linuxcnc.

The BIOS should be loading the USB, setup.exe has no part in the boot process with Linuxcnc.

What they have on their website in regard to instructions. Here: linuxcnc.org/docs/2.7/html/getting-start...etting-linuxcnc.html
From there it wouldn't show up as a bootable drive after it had been written. Tried utilizing various ISO mounters as well.

Are you absolutely positive you wrote the image to /dev/sdX and not /dev/sdX1 or something similar ? I spent a bit of time trying to walk someone through a "non-bootable disk" when in fact he was writing the image to /dev/sdc1 (for example) rather than /dev/sdc. The poor bloke was convinced the released image had an error.

When you said it wont show up as a bootable drive, is this via a BIOS menu or via you OS ?

The Linuxcnc iso is a what is known as a hybrid iso, some OS's have trouble reading the USB stick once it is written to. It's a pain and a bit of a trap sometimes but it is what it is.

The same maybe said of some iso mounters, I'm not up on the various windows utilities, but I usually just mount the iso via the cmdline under linux.

You haven't mentioned it but is your md5sum correct for the iso you downloaded ?

UNetbooting is known not to work for writing the Linuxcnc iso, I have had success with W32DiskImager a while ago.

You will notice that unetbootin will try to mount the iso then write files to the usb stick, from memory, this is not what you want. You need whatever utility you use to write the iso byte by byte directly to the usb stick. It will overwrite any existing filesystem and partion table on the stick. Some OS's will have trouble determining what filesystem is on the disk. Do not worry, if the md5sum of the iso is correct and there have been no errors writing the image to disk it will boot.

The best test of whether the image has been written to is trying to boot the image, what sequence of keys required to get the BIOS boot menu varies from board to board so you will have to check the requirements of your motherboard.

Tried that. Won't let me boot from it. Once on, all the files are visible on the Dvd though

I tried W32diskimager as well. I mean, it directly wrote to the usb drive as instructed. I wrote the image to whatever the USB name was after checking the config.

I know it can because that's how I loaded ubuntu initially