Dual Booting: Windows 10 & Ubuntu | Problem

Hello guys,

i am using Windows 10 on my Acer laptop.

I want to install Ubuntu and have a dual boot option.

I have successfully installed Ubuntu, but when I restart the laptop, only Windows 10 loads.

To fix this I tried the following (in this order):
 

1. Source: [https://itsfoss.com/no-grub-windows-linux/]
   In the Windows 10 cmd, as admin:
   bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
   
   But failed.
2. To reverse the previous:
   Source: [https://itsfoss.com/no-grub-windows-linux/]
   
   bcdedit /deletevalue {bootmgr} path \EFI\ubuntu\grubx64.efi
   
   but said I used the command wrongly.
   
   bcdedit /set {bootmgr} path \EFI\Microsoft\Boot\bootmgfw.efi
   
   successfully.
3. Source: [https://helpdeskgeek.com/windows-10/how-to-dual-boot-ubuntu-with-windows-10/]
   
   I used my bootable usb-ubuntu stick to:
   
   In the options panel I unchecked the Safe Boot option, or something like that.
   
   sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
   
   and
   
   sudo apt-get install -y boot-repair && boot-repair
   
   
   The output is:
   http://paste.ubuntu.com/p/7BWGKNtvDS/
    
4. After restarting I got a:
   Security Boot Fail message, and black screen.
5. To solve this:
   Source: [https://community.acer.com/en/discussion/436231/security-boot-fail]
   
   I pressed F2 with the Ubuntu USB in, and in the settings, I changed the Boot order to Windows.
   Now Windows works fine.
   But still no Ubuntu……..

I need Linux for a programming project, and this is tiring…
I recall dual booting on my desktop computer with no problem, and this is the 2nd time on a laptop I am having a hard time……

Any thought on what to do?

Thanks in advance, guys.

Really appreciate this forum.

May be info here you can use to get it working: Dual-Boot Ubuntu 15.04/14.10 And Windows 10/8.1/8: step By Step Tutorial With Screenshots