Bug#1110425: debian-installer installs GRUB to wrong disk (internal EFI instead of target USB) causing boot issues

[Holger Wansing <hwansing@mailbox.org>]

Hello,

Am 5. August 2025 10:49:15 MESZ schrieb smallbussiness <smallbussiness007@gmail.com>:
>Actual behavior:
>
>- GRUB was written to the internal EFI, and the GRUB configuration points
>to the USB root filesystem.
>- Internal system became unbootable without USB inserted.
>- There was no clear warning or choice to avoid this behavior during
>installation.
>
>
>System details:
>
>- Debian version: Debian GNU/Linux 12 (bookworm)

There were significant changes in this regard in Trixie, so you could try, if it works better for you with a beta image of Debian 13 (Trixie RC 3):

<https://www.debian.org/devel/debian-installer/>


Holger


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