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1 Answer
You may have somehow lost your grub boot manager and is using Windows boot manager. You can get the grub boot manager by reinstalling grub.
Perform the following:
Reinstall grub:
1 boot to the Ubuntu installation disk
2 Run the "Try Ubuntu" option
3) Bring up a terminal (Search for "terminal" Ubuntu launch/search button)
Run these commands (exactly):
a) sudo mount /dev/sdaX /mnt # Make "X" the partition that has Ubuntu installed (i.e. /dev/sda2).
b) for i in /sys /proc /run /dev; do sudo mount --bind "$i" "/mnt/$i"; done
c) sudo chroot /mnt
d) update-grub
e) if no errors skip this "e" section
grub-install /dev/sdX (x is the hard drive that has linux installed (i.e. /dev/sda)
update-grub 5) Reboot the system