Boot order

If you have chosen the dual boot, the new Ubuntu OS is ordered as the primary OS as below.

If you want to change the booting order, you can do it by the following commands.

$ sudo -s

[sudo] password for xxxx: yyyy

# cd /etc/grub.d

# ls

00_header 10_linux 20_memtest86+ 30_uefi-firmware 41_custom

05_debian_theme 20_linux_xen 30_os-prober 40_custom README

# mv 10_linux 11_linux

# mv 30_os_prober 10_os_prober

# update-grub2

Generating grub configuration file ...

Found Linux Mint 18 Sarah (18) on /dev/sda1

Found linux image: /boot/vmlinuz-4.4.0-31-generic

Found initrd image: /boot/initrd.img-4.4.0-31-generic

Found memtest86+ image: /boot/memtest86+.elf

Found memtest86+ image: /boot/memtest86+.bin

done

# reboot