I have a tri-boot computer (Ubuntu Mate 16.04.3LTS, Windows 7, Kali Linux). Until recently, grub menu showed at every boot just fine. However, tonight, I decided to exit Windows and load Ubuntu; I noticed that the grub menu never showed up and it just loaded automatically into Ubuntu. At first, I didn't think anything of it, because that's where I wanted. But now I can't get back into Windows.
I have tried:
- holding the shift key during boot
- running grub-update
- interrupting the boot process with ctrl+alt+delete
- performing boot-repair (log available at http://paste.ubuntu.com/26269885)
- and changed the etc/default/grub line25 by deleting the '#' from front of line "GRUB_GFXMODE=640x480" (and running grub-update again)
I don't know if this is related but i also noticed that when I reboot my computer, the Dell logo doesn't show up on screen either