[Bug 1087653] Re: grub2-signed doesn't support vfat file system on USB drive.

[Shih-Yuan Lee]

I can manually input the following commands in
grub2-signed=1.9~ubuntu12.04.1+1.99-21ubuntu3.5 and
grub2-sign=1.9+2.00-7ubuntu11 on USB drive to show GRUB menu.

search.fs_uuid 4B61-C71D root hd1,msdos1
set prefix=($root)/boot/grub
configfile $prefix/grub.cfg

So the problem seems to be that it will not read grub.cfg under the
(hd1,msdos1)/EFI/BOOT/ by default.

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https://bugs.launchpad.net/bugs/1087653

Title:
  grub2-signed doesn't support removable drive.

Status in OEM Priority Project:
  New
Status in “grub2-signed” package in Ubuntu:
  New

Bug description:
  * Package Versions
  grub2-signed=1.9~ubuntu12.04.1+1.99-21ubuntu3.5 in precise-proposed
  grub2-signed=1.9+2.00-7ubuntu11 in quantal.

  * Reproduce Steps
  1.  Generate a bootable USB drive by the following commands:
  $ sudo grub-install --removable --uefi-secure-boot --root-directory /media/username/UsbStick /dev/sdb1
  $ cp /boot/grub/grub.cfg /media/username/UsbStick/boot/grub/
  2. Use this USB drive to boot on UEFI BIOS.

  * Expected Result
  We can see the GRUB menu.

  * Actually Result
  We can not see the GRUB menu comparing to the USB drive made by the following commands:
  $ sudo grub-install --removable --no-uefi-secure-boot --root-directory /media/username/UsbStick /dev/sdb1
  $ cp /boot/grub/grub.cfg /media/username/UsbStick/boot/grub/

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