I've installed Ubuntu 14.04.3 in a partition along side Windows 10. Grub menu doesn't show up, it directly boots to Windows 10.
Here's my boot-repair info:
What do I do to get the Grub menu?
Assuming that you have dual booted correctly, you can try this:-
1. Go to boot menu option(by Pressing F9 or similar keys) 2. Choose Ubuntu
I was having the same issue in my HP Pavilion Laptop. Grub didn't showed up. Method above worked for me.