Woes installing Lubuntu on a Inspiron 3452

This note describes how to overcome an installation problem we had in today’s installfest. The system would not boot from the hard disk, and when trying to boot from a USB stick, we received a message saying: alloc magic is broken at 0xxxxxx.

What finally worked was this: In the BIOS setup, select UEFI boot and enable secure boot!.

Then boot into the USB grub menu.