I m new to this forum and to linux. I have windows 8.1 pre-installed in my HP 15-r007tx and I wanna make it dual boot with ubuntu. But last I tried I finished installing ubuntu based on a few videos on youtube but here is the deal. When I restart I dont get the grub bootloader. My system boots with windows directly. Someone please help me with this. Thanks in advance
If I am understanding your question, in order to boot to your "second" OS, whenever the computer initially starts up you need to go to your boot menu, I've never had a computer that automatically went to the boot menu so you have to ask it do that.
When your computer starts up it should have a message on the screen indicating which F-key it is to go to your boot menu. F12 is a pretty common one I believe. After you get into the boot menu select the hard drive your OS is on and then a list of the available OSes should come up, select the one you want and you should be good to go.