Failed to load ldlinux.c32

[simonwilliams]

OS: Ubuntu 24.04 VirtualBox: 7.0.16-dfsg-2ubuntu1.1, virtualbox-7.0_7.0.22-165102~Ubuntu~noble_amd64.deb (7.1.5-165995 times out accessing *.pxe file)

Summary: TFTP requests prefix VM name minus 1 word (e.g. Test VM vmlinux vs. Test vmlinuz)

Steps to reproduce:

wget https://dl-cdn.alpinelinux.org/alpine/v3.20/releases/x86_64/alpine-netboot-3.20.3-x86_64.tar.gz
tar xzvf alpine-netboot-3.20.3-x86_64.tar.gz boot/vmlinuz-virt boot/initramfs-virt boot/modloop-virt

mkdir ~/.config/VirtualBox/TFTP
cp boot/vmlinuz-virt "$HOME/.config/VirtualBox/TFTP/Test vmlinuz-virt"
cp boot/initramfs-virt "$HOME/.config/VirtualBox/TFTP/Test initramfs-virt"
cp boot/modloop-virt $a_web_server (see pxelinux.cfg/default, pxe.sdw.me.uk will be inaccessible)

docker run -ti alpine:3.20
# apk update && apk add syslinux

docker cp $container_id:/usr/share/syslinux/pxelinux.0 "$HOME/.config/VirtualBox/TFTP/Test Clone.pxe"
docker cp $container_id:/usr/share/syslinux/ldlinux.c32 "$HOME/.config/VirtualBox/TFTP/Test ldlinux.c32"

mkdir "$HOME/.config/VirtualBox/TFTP/Test pxelinux.cfg"
cat <<EOF > "$HOME/.config/VirtualBox/TFTP/Test pxelinux.cfg/default"
default alpine_virt
LABEL alpine_virt
MENU LABEL ^A - alpine virt
KERNEL vmlinuz-virt
INITRD initramfs-virt
APPEND ip=dhcp alpine_repo=https://dl-cdn.alpinelinux.org/alpine/v3.20/main/ modloop=http://pxe.sdw.me.uk/boot/modloop-virt
EOF}}}

Create a virtual machine:

Name: Test Clone
ISO Image: <not selected>
Type: Linux
Version: Other Linux (64-bit)
Memory: 256 MB
Storage: 256 MB (not used)
Network: NAT
Settings -> System -> Boot Order: Network only

Start VM
Witness success
Note that most TFTP file names don't match the VM name (specifically, they're missing the last word in the name)

The same applies for:

VM Name: Alpine 3.20 PXE
Prefix: Alpine 3.20

VM Name: Test
Prefix: <none>