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I have a Windows 10 on my Toshiba P50-B notebook. After installation and reboot, the machine boots into windows without showing boot options. I read a lot about Ubuntu and UEFI and made sure that:

  • W10 fast startup is off
  • I boot the USB install. media in UEFI mode (initial ubuntu menu is textual, not graphical)
    • i turned secure boot off in bios

While installing, i made sure, that ubuntu chose the EFI partition. When i click "change" on it, it was selected as EFI boot partition. I used boot repair disc afterwards, but didnt help me too. where can be the problem?

thanks!

george
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2 Answers2

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As you described in your question you already disabled Fast Boot in Windows ... please re-check !

You have to disable hibernation as well - open command prompt as administrator and execute : 

powercfg /h off

Now shutdown the machine completely - do NOT reboot !

Boot into BIOS and select Ubuntu in UEFI settings to be the default operating system to boot.

In case the GRUB boot menu doesn't appear when starting the computer :

Reinstall the GRUB boot loader to your Ubuntu installation in EFI mode.

Boot from the Ubuntu installation media - open a terminal and execute: 

    sudo mount /dev/sd*** /mnt
    sudo mount /dev/sd** /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/sd*
    update-grub

Note:

sd* = disk | sd** = efi partition | sd*** = system partition

To check and verify the partition numbers use GParted (included in the Ubuntu install media).
Boot into BIOS and select Ubuntu in UEFI settings to be the default operating system to boot.

cl-netbox
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0

SOLVED: You're right, its a hardware thing. My BIOS doesn't implement UEFI in the right way. It ignores EFI entries and always boots the same entry - bootx64.efi , see UEFI machine doesn't boot Ubuntu through NVRAM bootcatalog. How to fix? . So i manually created efi image for ubuntu with grub-mkimage and create grub.cfg as described in the link i pasted here (without the last menuentry). Now everythings ok! i can boot both ubuntu and windows.

Community
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george
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