Trouble installing LL 6.6 on 64 bit laptop

[stevef]

After a bit of digging around, found this article
https://wiki.archlinux.org/title/HP_EliteBook_840_G1

Though the article is about ArchLinux, it states

Even if UEFI, Arch Linux and (e.g.) GRUB are correctly configured and with the correct UEFI NVRAM variables set, the system will not boot from the HDD/SSD. The problem is that HP hard coded the paths for the OS boot manager in their UEFI boot manager to \EFI\Microsoft\Boot\bootmgfw.efi to boot Microsoft Windows, regardless of how the UEFI NVRAM variables are changed

If correct and your hardware is an Elitebook 840 or has similar UEFI (it has 'Customized Boot' listed in the screenshots) it may be worth looking at the workarounds in the article.