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I installed Ubuntu 16.04 in an Acer R5-571T 59DC notebook for dual booting with the preinstalled Win 10 (UEFI). After restart there is no grub menu and the pc boots directly on windows. I disabled secure boot and fast boot before install, and also used "boot repair" with a live usb. No luck. I managed to start Ubuntu using Super Grub2 Disk, so I think grub is ok but without the super grub pendrive I cannot boot ubuntu. Your help is appreciated.

  • Did you disable "fast startup" in Windows? – wjandrea Aug 29 '16 at 0:54
  • Does the EFI boot menu (some function key at power-up) give you an ubuntu entry? Does it work? – ubfan1 Aug 29 '16 at 3:08
  • fast startup was disabled in Windows and in EFI boot menu only was Windows. – systemcrash Aug 30 '16 at 4:49
  • Now after enabling secure boot the option for adding Ubuntu to the EFI boot menu was enabled. The pc is still starting windows directly but I can stop it with the F12 key to show the menu and start GRUB – systemcrash Aug 30 '16 at 4:52
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Upgrade, update the system, and install grub. After that your problem will get solved.

For update:

sudo apt-get update

For upgrade:

sudo apt-get upgrade

For installing grub, follow this link How do I manually install GRUB?

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I found a good enough solution. I enabled secure boot again in the UEFI settings and after that the option for adding the new OS to the EFI boot menu was enabled. Now when I access it with F12 key I have both the Ubuntu & Windows options. Thanks wjandrea for your answer

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