installation of 1.0.0 failed on a new laptop, during the "install grub" phase. took a little bit of time to figure out, but it turns out that this laptop has OsIndicationsSupported efi var of 0x1f, and that bash doesn't really like "if [ 1f & 1 ]"

fix was to edit /etc/grub.d/30_uefi-firmware and change the "printf %x" to "printf 0x%x", though i guess %d would have done the trick also

just thought i'd mention this in case anyone else trips over it