'Invisible' boot loader - Ask Ubuntu


symptom

windows \ ubuntu 16.10 dual boot install not show grub menu (black screen). when 'invisible' boot loader waiting input, pushing arrow key down 4 times boot windows partition, doing nothing boots 16.10. suspect grub installed.

update: monitor reports 'frequency out of range' during boot loader wait user input

goal

boot loader presents menu options boot windows or ubuntu

questions

what diagnostics can performed better understand current state , advance goal?

  1. boot ubuntu
  2. open terminal unity dashboard
  3. type cd /etc/default
  4. edit file grub either sudo pico grub or gksu gedit grub
  5. change line:
 grub_cmdline_linux_default="quiet splash"   grub_cmdline_linux_default="quiet splash nomodeset"
  1. save edited file, , quit whichever editor chose
  2. type sudo update-grub
  3. reboot computer
  4. check make sure have latest/correct video driver installed

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