If you do not remember, then I will assume that you did. You would have to step in and say no, to not install it...
So, first, start up on your install media, and instead of using "Install", use the "Try" option. In the File Manager > Other > look for the /EFI directory and look for Ubuntu EFI file. You said in your first post that you found it. It should be in the path /EFI/ubuntu/... It's most likely going to be something in the path/filename like "\EFI\ubuntu\grubx64.efi" Write that down exactly, including the case.
Then shutdown the LiveCD Environment, Remove the Install media, reboot, and let it boot into Win 10...
In Win 10, hit the Windows Key, type CMD. Right click on "Command Prompt". Select Run as Administrator. At the CLI Command Prompt, type:
Code:
bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
Modify that to whatever that path and filename was. Shutdown Windows and reboot. It should be using the Grub2 menu now...
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