Dual boot Windows 10 and Ubuntu 16.04 - FAIL
 

I am trying to install Ubuntu 16.04 and have a choice between Windows 10 and Ubuntu.
I have done this many times in the past. My computer crashed and I took it to the tech shop and had Windows 10 reinstalled. Now I cannot seem to get the dual load option.
Here are some BIOS details, which I hope will help.

This is what my Bios looks like under the “Boot” menu.

Boot

►LEGACY BOOT:
Hard Drive
CD/DVD/CD-RW Drive
Network

►UEFI BOOT:
Windows Boot Manager (WDC WD10JPVT-75A14TB)

Secure Boot <Disabled>
Load Legacy Option Rom <Enabled>
Boot List Option <UEFI>
•Legacy
•UEFI


So it appears I that,”UEFI”, is selected. Shown in blue.
If I select,”Legacy”, the computer will not boot up at all.

I could use some advice here, for sure. As I wrote, this is not the first time I have tried to dual boot Windows with Ubuntu. I have done it for years.

Thanks for reading.

Generally it is easiest to get the boot list after a power-on with the Ubuntu USB inserted - maybe F10 or F12 something like that. Watch the splash screen after power-on for hints.
That should add two (temporary) entries for the USB - one UEFI, one not. Pick the UEFI entry; at the end of the install an entry will be added to the motherboards NVRAM for Ubuntu.

Thanks for the reply.
I looked at the screen after pressing,"F12", and attempted to change to the UEFI choice. On the restart, I received this message.
"PXE-MOF: Exiting PXE-ROM - No Boot Device Found. Press any key to reboot machine."

I am really out to sea on this one. I downloaded the Ubuntu 16.04 and burned it to a DVD disc like I always have done. I ran Ubuntu from the disc to check it and everything worked okay. I then installed.
I am pretty sure I do not have the right setting in BIOS but cannot figure out what the correct settings are.

If you took your computer to a tech shop to have windows re-installed, they undoubtedly simply have overwritten everything and your Ubuntu is gone so the question is, did you re-install Ubuntu after this event and now have this problem. If you don't have a windows installation DVD, it would be a very good idea to create a Recovery disk if you do have a recovery partition with your new install.

Newer systems with UEFI have different install options. I'm not sure what point you are at, whether you have re-installed Ubuntu or not but, the link below is the official Ubuntu documentation on dual-booting with a windows UEFI system.

https://help.ubuntu.com/community/UEFI

It isn't clear from your posts what you can do, boot just windows and not Ubuntu? Neither?
You need to boot the install DVD UEFI (explained at the link) and install UEFI if windows is UEFI or you will have problems booting both systems. This is explained in detail at the Ubuntu link above.

You should be able to verify that you have a UEFI install by running the Ubuntu DVD and opening a terminal and running: sudo gparted
That will show attached drives and partitions and one of them should be EFI.

Check the boot order or boot list in the BIOS for allowed devices using F12.