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Here's what I did.

  • Wiped hard drive clean.
  • Partitioned main drive into 2 parts.
  • Installed windows 10 on first part.
  • Booted Kubuntu live, created swap partition, and root partition, mounted to /
  • installed Kubuntu, reboot
  • Grub doesn't show up, computer boots straight to ten.
  • boot live cd.

  • Ran These commands:

    mount /dev/sda6 /mnt
mount --bind /dev /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt
grub-install /dev/sda
update-grub
exit

    then again ,

    umount /mnt/dev/pts
umount /mnt/dev
umount /mnt/proc
umount /mnt/sys
umount /mn

    Reboot. Computer boots straight to ten, no grub menu.

Computer is not running UEFI but it does have GUID partition tables. What am I missing here?

NIMISHAN
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xero
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    Windows only boots from gpt partitioned drive with BIOS. And Windows only boots from MBR(msdos) partitioned drives with BIOS. And Ubuntu should be installed in same boot mode as Windows. What brand/model system. Usually better to use UEFI if newer hardware.http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-uefi-supported-windows-8-system And Windows need these: http://technet.microsoft.com/en-us/library/dd744301%28WS.10%29.aspx – oldfred Dec 12 '15 at 04:39

1 Answers1

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If you're BIOS has the option try switching from UEFI to Legacy.

Edit: I just reread and noticed you're not running UEFI. Ignore the first sentence above.

Backup Windows partitions. No need for Ubuntu partitions backup since apparently fresh install.

Switch BIOS back and launch live CD then chroot into your Ubuntu install again as you did before.

Install EFI bootmanager

sudo apt-get install efibootmgr

A list of your partitions should come up. Make note of the numbers used for Windows and Ubuntu root.

Set Ubuntu to boot first. If you're numbers are, for example, Windows=1 and Ubuntu root=2 run:

sudo efibootmgr –o 2,1

Reboot and you should have a boot menu to choose from.

Edit/Notes: It's not clear why you are using GPT without UEFI. Windows sets up a GPT partition table when it's installed while UEFI is enabled.

https://msdn.microsoft.com/en-us/library/windows/hardware/dn898510%28v=vs.85%29.aspx

Otherwise it sets up a MBR partition table with UEFI disabled.

https://msdn.microsoft.com/en-us/library/windows/hardware/dn898504%28v=vs.85%29.aspx

Did you install Windows 10 while in UEFI mode and then switch? If you did and then switched the mode to legacy after and if this is a fresh install for both, which it sounds, you many want to start over and switch your BIOS to UEFI from the beginning to end if you want to use GPT. You may still need to install efibootmgr and change the EFI boot order after installing Ubuntu or if your BIOS has the option you can change it there.

Otherwise if you're not going to use UEFI you should start over and install Windows without UEFI enabled and install Windows 10 with MBR partition table. Then install Ubuntu and use GRUB.

Almost forgot...make sure Windows Fastboot is disabled. It's like a always on hibernate at shutdown. It can prevent loading other operating systems and if you do manage to load another OS there's a potential for corruption of the Windows system. The link below is Windows 8 but still applies to 10.

Why disable Fast Boot on Windows 8 when having dual booting?

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Brian Huggins
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