Subject: bug#19220: GRUB fails to find the ‘bzImage’ file when ‘/boot’ is on a separate partition

From: Nikita Karetnikov <[email-masked]>
Date: Sun, 30 Nov 2014 00:34:26 +0400

Adding ‘set root=(hd0,gpt3)’ (which should match your ‘/’ partition)
before the ‘search.file’ line in the GRUB config fixes the issue.