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I've installed Ubuntu correctly (in UEFI mode), the only problem I've got now is that it won't load any manager to choose which OS to load at startup. It goes directly to Windows 10 like nothing happened even though when I keep pressing esc at startup and then i go in in boot order with F9 and choose Ubuntu it loads normally but, as you can imagine, it's not that comfortable.

This is my pastebin from boot-repair that went apparently good: http://paste.ubuntu.com/12649013/

Thanks.

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First you have to boot into Windows and disable hibernation and Fast Boot from within there.

To disable hibernation open command prompt as administrator and execute this command: 

powercfg /h off

To disable Fast Boot open Control Panel go to Energy Settings, enable show hidden settings and uncheck Fast Boot. After these steps shutdown the machine (do NOT reboot) completely.

Then reinstall GRUB bootloader to your Ubuntu installation in EFI mode
Boot from the Ubuntu install media - then open a terminal and execute: 

sudo mount /dev/sda8 /mnt
sudo mount /dev/sda2 /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sda
update-grub

Now you can choose which operating system you want to boot from the GRUB boot loader menu.

Note :

sda = disk | sda2 = efi partition | sda8 = system partition
disk and partition numbers taken from your pastebin output

To get sure - check the partition numbers, you can easily identify them with GParted.
The (Graphic User Interface) tool is already included in the Ubuntu installation media.

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  • I've done every step you told me,now it's just slower to access Windows but nothing has really changed... EDIT:I just noticed that from power options I only see sleep and lock, fast boot option is not there anymore even though I'm sure to have that disabled since installing Ubuntu.
    – Tatoalo
    Oct 3, 2015 at 17:44
  • Same as before, from F9 boot order YES but not as I was trying to achieve
    – Tatoalo
    Oct 3, 2015 at 17:56
  • @Tatoalo : Please check in UEFI settings which system is the default one to boot. If it is Windows then change it to ubuntu and you should see the GRUB boot loader when starting the PC.
    – cl-netbox
    Oct 3, 2015 at 17:58
  • I've tried but from there I cannot change boot order...EDIT: BTW This is what I see on startup now:i58.tinypic.com/2ajxqqf.jpg
    – Tatoalo
    Oct 3, 2015 at 18:08
  • @Tatoalo : Please tell me : can you boot into both systems - into ubuntu and into Windows ?
    – cl-netbox
    Oct 3, 2015 at 18:10

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