Now in Lenovo's laptop, we still meet this issue on trusty(14.04.2).
I delete the grub.cfg in recovery partition, after that it will enter grub
shell.
from the result, I thought the $prefix is zero or not exist.
grub> cat (memdisk)/grub.cfg
if [ -z "$prefix" -o ! -e "$prefix" ]; then
if ! search --file --set=root /.disk/info; then
search --file --set=root /.disk/mini-info
fi
set prefix=($root)/boot/grub
fi
if [ -e $prefix/$platform/grub.cfg ]; then
source $prefix/$platform/grub.cfg
else
source $prefix/grub.cfg
fi
The file debian/build-efi-images of package grub2-2.02.
Grub executed the "search --file --set=root /.disk/info" first, try to
find out the "root". Because .disk/info was exist on USB stick and HDD0
Partition2, so the result included 2 results. But the USB stick was the
first. So the grub.cfg on USB stick was loaded and the system was booted
from USB stick.
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https://bugs.launchpad.net/bugs/1097570
Title:
grub2-signed can not find the right device when there are two
filesystems containing the file '.disk/info'.
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