Re: problem installing trixie - no EFI

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

Titus Newswanger wrote:
> I just now inserted a Debian 12 installer usb and rebooted, making sure to
> catch the bios boot device selection screen. It presented me with 9 boot
> options:
> 
> # 6 was "General UDisk 5.00"
> 
> # 9 was "UEFI: General UDisk 5.00"
> 
> My other 7 boot options are irrelevant to this.
> 
> If I boot the 6th option and install Debian it will install like you
> described above. If I boot the 9th option and install Debian it will create,
> among others, an efi partition mounted at /boot/efi that will not be empty.

It might be that the 6th option which boots as Legacy BIOS will not be
offered if the first 446 bytes of the USB stick get zeroized.
With carefully chosen /dev/sdX:

  sudo dd if=/dev/zero bs=1 count=446 conv=notrunc of=/dev/sdX

This will deface the x86 code area of the Master Boot Record, where
Legacy BIOS begins to boot from a USB stick.

Instead of the USB stick after copying the .iso, one could also
treat the .iso before copying it to the USB stick:

  dd if=/dev/zero bs=1 count=446 conv=notrunc of=debian-12.11.0-amd64-netinst.iso


Have a nice day :)

Thomas