Kali / Ubuntu / Debian Linux update efi grub/ grub2 bootloader and set correct bios systime

kali-linux-grub2-efi-fix.sh

#!/bin/bash
#
# Kali / Ubuntu / Debian Linux update efi bootloader and set correct bios systime
# (C) 2021 suuhm
#

apt clean; apt update && apt install os-prober ntpdate

echo "Set up correct time:"
ntpdate pool.ntp.org && hwclock --systohc

sleep 2
echo "check"
efibootmgr -v

sleep 2
blkid ; echo
echo -n "Input BLKUUID: (y/n): " ; read -r BKL_UUID

echo "Set up GRUB now:"
sleep 2
cat << EOF >> /etc/grub.d/40_custom
menuentry "Windows 10 EFI-LOADER" {
search --no-floppy --set=root --fs-uuid $BKL_UUID
chainloader /Windows/Boot/EFI/bootmgfw.efi
}
EOF

update-grub; update-grub2
echo "Done, pls reboot now"