Public bug reported:

I was  trying to seed U-Boot on an x86 image. scripts/ubuntu-core-rootfs
can not detect the bootloader actually in use. In my case, U-Boot will
be completely ignored on x86. Snappy can however detect bootloader type
successfully with other criteria on boot_partition instead of on
rootmount, which is inconsistent with initramfs-tools-ubuntu-core.

initramfs-tools-ubuntu-core should either
1. take over system-boot mount and use /boot/uboot/uboot.env and 
/boot/grub/grub.cfg to detect the desired bootloader type, or
2. support bootloader type override through kernel cmdline, e.g. new parameter 
"snappy_bootloader=uboot"

** Affects: initramfs-tools-ubuntu-core (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1563737

Title:
  Bootloader type detection ignores the actual bootloader in use

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