ubuntu-mate / # update-grub
Generating grub configuration file ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-3.16.0-4-amd64
Found initrd image: /boot/initrd.img-3.16.0-4-amd64
mount: /dev/sdh1 is already mounted or /mnt/h1 busy
Found Windows 7 (loader) on /dev/sdb1
Found Ubuntu 16.04.1 LTS (16.04) on /dev/sdg1
done