Comment 1 for bug 1098885

Please relabel as "user error" when chainloading PC-BSD <G>. I purged grub-customizer and grub, reinstalled grub2 (LMDE) to start from a clean slate and properly edited /etc/grub.d/40_custom, then reinstalled grub-customizer-3.0.4.

my /etc/grub.d/40_custom is:

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'PC-BSD 9.1(64) (on /dev/sdc1) (hd1,1)'{
    set root='(hd1,1)'
    chainloader +1
}

Regards,
MarkB