> Laptop does not support UEFI

Then how and why is the firmware booting \efi\boot\bootx64.efi from this
CD?

This is certainly not a syslinux bug, syslinux only provides a BIOS
bootloader on these images and never attempts to chain to the EFI
bootloader.  Reassigning to shim; but if the laptop doesn't properly
support UEFI, then you should probably make sure the firmware isn't
trying to do a UEFI boot of the disk.

> Under Ubuntu 16.04, "sudo efibootmgr" reports that "EFI variables are
not supported on this system."

This doesn't actually tell us anything.  If Ubuntu was installed in BIOS
mode and the system is booted in BIOS mode, this is the result, even if
the firmware does support UEFI.

** Package changed: syslinux (Ubuntu) => shim (Ubuntu)

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https://bugs.launchpad.net/bugs/1810070

Title:
  18.04.1 Live CD fails to boot with EFI errors

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