Try making the directory /boot/efi/EFI/boot. Then just copy everything from /boot/efi/EFI/Debian into that directory and then rename grubx64.efi to bootx64.efi in that directory.
From: Robert Gomułka <robert.zbigniew.gomulka@gmail.com>
Sent: Saturday, April 11, 2020 3:08 AM
To: Limonciello, Mario
Cc: debian-efi@lists.debian.org
Subject: Re: Request for help - Debian UEFI not possible after starting windows
Good morning everyone,
I have checked few things.
1. I have Debian version 10.1
2. I have installed grub-efi-amd64-bin (it was installed previously, not now). After trying to install grub-efi-amd64 I get message that it is not available but referred by another package.
So I can't reconfigure no-bin version.
3. Inside /boot/efi/EFI/Debian I have grub.cfg and grubx64.efi. I don't know how meaningful are those names, but can't tell what to copy, either.
Could you provide further advise?
Dell Customer Communication - Confidential
> -----Original Message-----
> From: Robert Gomułka <robert.zbigniew.gomulka@gmail.com>
> Sent: Saturday, April 4, 2020 1:43 PM
> To: debian-efi@lists.debian.org
> Subject: Request for help - Debian UEFI not possible after starting
> windows
>
>
> [EXTERNAL EMAIL]
>
> Good evening,
> I couldn't find better place to ask, but apologize if that's not proper
> forum.
> I appreciate all the work Debian maintainers put in maintaining whole
> (U)EFI thing. I am not familiar with its concepts, so please bear with me.
> I have employer owned laptop (Dell 3541). I'd like to use it, but in order
> to not abuse anything on their disks, I have installed Debian on external
> SSD (pendrive). I have done it year ago on different laptop without UEFI,
> so I had to convert it to UEFI when new computer had UEFI in place. I've
> thought I did it correctly (re-partitioning, installing grub efi, ...) The
> problem is - after booting windows Debian is not visible any more and
> can't be started.
> The operations I perform are:
> 1. Start and use windows without Debian pendrive inserted.
> 2. Reboot system from Debian Live (another USB stick) 2a. I press F12 in
> bios to select boot from Debian Live 2b. My ordinary "debian" entry in
> bios boot up is not available (not visible) 3. Debian Live is started 4. I
> insert my Debian pendrive 5. I "rescue" it by mounting its filesystem
> following instructions from here: http://emmanuel-
>
galindo.github.io/en/2017/04/05/fixing-debian-boot-uefi-grub/
> (just a subset - mount, chroot, grub-install, update-grub) 6. I restart
> system 7. I am able to select "debian" in boot up bios menu 8. I can boot
> up Debian successfully 9. Unless I boot up windows (without my Debian
> pendrive inserted), which leaves me at 2
>
> Do you have any idea of how to debug/fix it? Even if Windows somehow
> messes my bios settings, I still can boot from Debian Live in UEFI mode.
> But can't do the same for my Debian pendrive. Is there something I can do
> to make my pendrive appear the same way as Debian Live?
> Fixing it each time is inconvenient...
On your Pendrive copy the efi/boot/shimx64.efi to efi/boot/bootx64.efi
Then you should see your pendrive as a bootable entry every time it is plugged
in.
This is the so called 'removable drive' path that the firmware should be checking
for dictating it's bootable.
>
> A friend of mine uses very similar setup, but with Ubuntu - in his case
> menu entry doesn't disappear after booting to Windows.
>
> I don't remember Debian version currently, probably current stable. If it
> matters, I can provide it (along with other information).
>
As another solution, what if you try to copy your bootloader into the ESP
of the disk on the machine and use that?
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