He is using linux-6.6, which is the same version as guix's linux-lts.
This is probably because older kernels don't support the KEXEC_FILE_DEBUG flag that is passed to kexec-load-file unconditionally. To fix, remove the use of KEXEC_FILE_DEBUG in guix/scripts/system/reconfigure.scm I didn't test it, but it makes sense. proof flag doesn't exist https://kernel.org/ latest longterm tarball wget "https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.6.69.tar.xz"; tar xf ./linux-6.6.69.tar.xz grep -r "KEXEC_FILE_DEBUG" ./linux-6.6.69 observe the absence of results. repeat with the latest stable kernel and observe that it exists. there is a check on flag validity in /kernel/kexec_file.c using KEXEC_FILE_FLAGS
