Comment 1 for bug 1134770

Yes it happens on a physical installation. I mounted the current cdimage raring-desktop-amd64.iso and it contains /casper/vmlinuz.efi but not /casper/vmlinuz.

All the files in /casper:
filesystem.manifest
filesystem.manifest-remove
filesystem.size
filesystem.squashfs
initrd.lz
vmlinuz.efi

On an older ISO (11.10) it is identical, except that vmlinuz.efi is not there (obviously) and vmlinuz is there.