qubes-builder not resulting in clean iso, (xen) ELF: Not an ELF binary

[Justanotherguy]

tldr; tried multiple attempts making my qubes iso.

Both times resulting in the failure with error;

```

"(xen) ELF: Not an ELF binary"
"Panic on CPU 0:"
could not construct domain 0"

```

Setup as follows;

new fedora-32 template

git clone qubes builder

cp example-qubes-os.conf builder.conf

`DISTS_VN ?= fc32 buster`

`BRANCH_linux_kernel=master`

make install-deps

.. Then I have tried:

Attempt #1)

make get-sources

make qubes

make iso

Attempt #2)

make qubes-os-iso

I then wrote the resulting iso using the dd command

`sudo dd if=xxxx.iso of=/dev/sdY status=progress bs=1048576 && sync`

Both attempts result in the same error when trying to install

"(xen) ELF: Not an ELF binary"
"Panic on CPU 0:"
could not construct domain 0"

In legacy and UEFI boot mode, the error looks like this...

In UEFI mode the same error occurs but then there is a little bit more output..

Googling 'Page Fault' and 'Panic on CPU 0' has not led to much enlightenment about how to go about resolving the issue.

Any help/guidance much appreciated.