Windows 10: Help with dual booting Win 10 and Ubuntu

Hello, My laptop has two hard drives: in the main location is an SSD with Win 10 and in the DVD drive bay is an HDD with Ubuntu. Both are Legacy BIOS. Win 10 uses MBR in /dev/sda1 and Ubuntu GRUB2 which is at /dev/sdb. I am trying to use the Windows bootloader to give me a selection screen where I can choose Win 10 or Ubuntu and have a configurable timeout. I think I am almost there. I installed EasyBCD and added Ubuntu to the bootloader. When I boot up I can choose between Win 10 and Ubuntu... if I choose Win 10 it continues booting into Win 10 but if I choose Ubuntu it actually reboots first then takes me to the GRUB2 menu for Ubuntu. If I then choose Ubuntu from the GRUB2 menu if carries on booting into Ubuntu. If I choose Win 10 from the GRUB2 menu it goes back to the Win 10 bootloader screen where I again need to choose Win 10 OR Ubuntu but if I choose Win 10 this time it carries on booting in to Windows whereas once again if I choose Ubuntu it has to reboot first then I am back to the GRUB2 menu. Sorry this is so long! My question: is that normal behavior? If you select Ubuntu from the Win 10 bootloader screen it first has to reboot then the GRUB2 menu appears. Why does it have to reboot if I choose Ubuntu from the Win 10 bootloader screen? Did I set it up wrong with EasyBCD? Cheers, Flex

:)

 

Help with dual booting Win 10 and Ubuntu

This is your whole problem. What you should have done is to put GRUB in sdb1 and Windows Manager in sda1 so that Windows Boot Manager is in control.
So what suggested above will not make any difference. GRUB is still in control of booting process.
To fix your problem. You will need to:

1. Move GRUB from sdb to sdb1
   |grub2 - how to move grub boot from one partition to another in linux - Ask Ubuntu
2. Rebuild The Windows Boot Manager ie. create a brand new BCD to boot Windows 10.
3. Once done with steps 1 and 2 above. Windows will not know UBUNTU exists and vice versa.
   Depend on the priority set in the BIOS, it will boot directly into that OS.
   However, you can boot either one from Boot Menu (Using whatever key that your Laptop assigned to: F2, F10....)
   Since I hate Dual Boot and seldom boot into Linux, I will stop here.
   Now, go to step 4 to create dual boot.
4. Use Easy BCD to create an entry for dual boot with UBUNTU. Once done, you should get a nice GUI dual Boot Menu
   and it will boot directly into either Windows or UBUNTU.

Here's the detailed explanation: How can I move windows 10 boot files to another drive to allow linux

 

Help with dual booting Win 10 and Ubuntu

@Megahertz (Luiz),
By default Linux will install GRUB in the MBR (Master Boot Record) of the disk, not on any partition and being read by the BIOS to boot from. With his current configuration, The Windows Boot Manager is not used, GRUB is in full control of booting process. That's why I suggest to move GRUB from MBR to sdb1 ie. partition 1 where UBUNTU is installed to keep the 2 OS's separate. Windows will use Windows Boot Manager to boot from and UBUNTU will use GRUB to boot from. To make dual boot, use Easy BCD to create an entry using Grub2. You'll end up with Windows GUI dual boot screen. To remove dual boot, run "msconfig" and delete the entry.
Screenshot 1 is his current configuration. Screenshot 2 is what I suggest and is my configuration.

 

Dual boot Windows 10 and Ubuntu 16.04?


Once I had Windows 10 RTM dual booting with Linux 17.2. No issue whatsoever.

Here is a tutorial on dual booting Win 10 and Ubuntu 15.04
http://www.linuxandubuntu.com/home/d...th-screenshots