You can run the following command which will search all the attached drives and partitions and add them to the grub menu:
$ sudo update-grub
After running the command from the console reboot the computer.
If you don't see the menu after rebooting run this command and show us the output. It would be easier to read a copy and paste of the output to your question (not a link to an image). You can select the text and click on the "{}" icon on the editor to give the proper format.
$ egrep "^menuentry" /boot/grub/grub.cfg
For example the output of this command on my computer is:
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-3ebc689f-aa43-4ea1-a9b9-5e8d9e6d92af' {
menuentry 'Memory test (memtest86+)' {
menuentry 'Memory test (memtest86+, serial console 115200)' {
menuentry 'Ubuntu 15.10 (15.10) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-a13034ce-00a0-4bd2-8188-f780137413d7' {
There isn't a Windows entry on my system because Windows isn't installed. If you have windows installed on your system we will see it in the automatically created grub.cfg file.
$ sudo fdisk -lin your question. What is your reference to "E" drive. Are you saying "E" as in the 5th of five physical individual hard drives? The output of the command will probably answer that confusing component of your question..$ sudo fdisk -lin your question it would add clarity to the confusion. The answer to your question, based on what you have presented, you only see Ubuntu because that is all that you have installed on your computer. After adding Ubuntu you would have Ubuntu and Windows as a boot option if Windows was actually installed on your computer.