I have two identical Dell Latitude E7470 laptops. On each of them, when I
got them I booted a Fedora Live USB stick, installed gparted, and used it
to shrink down the Windows 10 partition to make room for Fedora. I have
done this process on a lot of laptops going back a lot of years, and this
is the first time I have seen this problem.

On one of the laptops, as soon as I boot into Windows 10, I can no longer
boot Linux. GRUB is somehow trashed and the only way to boot the system is
to select "Windows Boot Manager" in the BIOS, which successfully boots
Windows 10. The other laptop does not have this problem; I can boot
Windows, then get the usual GRUB menu at the next boot and select either
Windows or Fedora, and all is good.

Has anyone ever seen this kind of problem before? Is there a way to recover
GRUB? Last time this happened, I ended up having to completely reinstall
Fedora to get the system back to dual boot. It has now happened again and I
would like to avoid having to reinstall to recover. I would, of course,
also like to prevent this from happening in the first place.

The systems are both using EFI boot, without secureboot.

Thanks for any insights,
--Greg
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