https://wiki.archlinux.org/index.php/GRUB#Generating_main_configuration_file
https://wiki.manjaro.org/index.php?title=Grub-Customizer

http://www.unixmen.com/fix-shutdown-power-computer-ubuntu-14-04/

tutorials:
http://rus-linux.net/MyLDP/boot/GRUB2-full-tutorial.html