tnewman@utopic:~$ sudo os-prober && sudo update-grub
/dev/sda1:Windows 7 (loader):Windows:chain
/dev/sda8:Ubuntu Vivid Vervet (development branch) (15.04):Ubuntu:linux
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.16.0-33-generic
Found initrd image: /boot/initrd.img-3.16.0-33-generic
Found linux image: /boot/vmlinuz-3.16.0-23-generic
Found initrd image: /boot/initrd.img-3.16.0-23-generic
Found memtest86+ image: /memtest86+.elf
Found memtest86+ image: /memtest86+.bin
Found Windows 7 (loader) on /dev/sda1
Found Ubuntu Vivid Vervet (development branch) (15.04) on /dev/sda8
done