If you are dual booting Windows 10 with Ubuntu. Install Grub to EFI partition.
grub-install -V
grub-install –version
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Description:
Unzip and copy the “Aurora-Penguinis-GRUB2” folder in:
/boot/grub/themes
(create the themes folder if not exist)
add:
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
GRUB_THEME=/boot/grub/themes/Aurora-Penguinis-GRUB2/theme.txt
to:
/etc/default/grub
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Finally, update grub config to take effect by command:
sudo update-grub