Comment 2 for bug 1173457

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Robert Munafo (mrob27) wrote : Re: Ubuntu 13.04 Desktop 64 bit install uses wrong ESP for secure boot laptop

This still happens with Ubuntu 16.04.1. I have a "Live CD" on a 4GB USB stick (which ends up being /dev/sdb), a valid Linux installation (Lubuntu) in the internal HDD (4 partitions, /dev/sda), and the laptop's BIOS has secure boot enabled. When trying to use "something else" and manually setting up the partitions on a new blank 32GB USB stick (/dev/sdc), the install proceeds as expected; but attempting to boot the HDD without the 32GB stick present results in the GRUB command-line prompt. I can only make a standalone bootable external UDB drive by first formatting the internal HDD (which indeed I ended up doing).

A third user is affected, see askubuntu.com/questions/771017