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I followed these instructions (in the link) for installing GRUB. Needing Win10, as we do here in this hardship post**, I switched disks, and I was surprised to find no action.
https://www.jeremymorgan.com/tutorials/ … rch-linux/
Installed it again, and it worked. Switched disks again - nothing. Turns out the NVRAM pointer to the grub..cfg file was gone after Win had been there. You can (most likely) use the boot config system to find and execute the grub-.cfg file, which I did, which worked. Seeing this, I learned that UEFI auto-looks for boot-.cfg files, so I renamed the GRUB file and put it in a looked-for directory. GRUB has a 'removable' parameter that has the same effect.
Rather than get into the debate, I am wondering if we can boot directly from the boot flash, because it is much bigger than it was under BIOS. In fact..., never mind.
**(not a single commercial linux install, mostly AS400, despite IBM being here)
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