Nix iso unable to boot in UEFI mode (but other distros can)

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Replying to myself.

Here is what I did to workaround the issue:

  1. Boot into Debian using their USB installer
  2. Install Nix in Debian sh <(curl -L https://nixos.org/nix/install) --daemon
  3. From there, build a NixOS to kexec (see documentation NixOS 23.11 manual | Nix & NixOS): nix-build -A kexec.x86_64-linux '<nixpkgs/nixos/release.nix>'
  4. apt install kexec-tools
  5. cd result && ./kexec-boot
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