Boot option to Choose os

I am Using Hp 15doo2tx  model laptop
In my laptop I have installed two operating System(OS) Windows 8.1 & Ubuntu in different partitions. When I switch on my lap  it was not showing any options for choosing OS automatically windows is booting. If I want to boot Ubuntu  then I want to go for  boot option in the bios and I need to choose Ubuntu. I need options to choose the OS before booting how should I do it. can any one help me?
I have also edited the grub file (/etc/default/grub) in Ubuntu and made the  time out to 10 seconds still problems remains.
What is the changes to be made in the  BIOS settings to show OS options before booting?

RaguS wrote:
I am Using Hp 15doo2tx  model laptop
In my laptop I have installed two operating System(OS) Windows 8.1 & Ubuntu in different partitions. When I switch on my lap  it was not showing any options for choosing OS automatically windows is booting. If I want to boot Ubuntu  then I want to go for  boot option in the bios and I need to choose Ubuntu. I need options to choose the OS before booting how should I do it. can any one help me?
I have also edited the grub file (/etc/default/grub) in Ubuntu and made the  time out to 10 seconds still problems remains.
What is the changes to be made in the  BIOS settings to show OS options before booting?
You might to also chekc out the Ubuntu forum as well...a simple search did come up with info from Ubuntu site...
http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-8-64-bit-system-u...
I am a Volunteer to help others on here-not a HP employee.
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