Interestingly, I just bought a refurbished computer for a client that came with Windows 10 and it only has BIOS: no UEFI! That means that Windows 10 does not need UEFI to work any more than Ubuntu does. They are simply using UEFI as a tool for restraint of free trade, a crime.
So, if you want to dual boot Windows and Ubuntu you can turn off UEFI, reinstall Windows (it does just like Ubuntu. If installed on a BIOS system it installs as BIOS, if installed on a UEFI system it installs as UEFI) and then install Ubuntu. I still recommend two separate hard drives, one for each operating system. Windows has a license to kill and does so without apology.
So neither UEFI nor BIOS is a barrier to Linux installation. Computers that are nasty to set up are because their BIOS menu screens are lousy. My HP All-in-One is a gem of carefully concealed options, hiding behind unknown acronyms meant to keep you from knowing what to do.
So BIOS/UEFI is pretty much a non-issue. I much prefer to use a computer under BIOS so the boot menu is available at bootup. Then I can keep USB and DVD boot out of the boot path, but still have them available to boot from with an <F12> during the boot process. I can also adjust BIOS settings during bootup if I want. That stuff just isn't possible with UEFI.
And while Microsoft flaunts UEFI as a new day in computer security, keeping you safe from things that have never happened to you in 20 years, twice a day they scoop up parts of all files on your system, including corporate secrets if you are a business foolish enough to drink their koolaid, encrypt and compress them into a still huge block that they send to Microsoft at your expense. You are not permitted to know what information they collect, why they collect it or what they are doing with that information.
It's the same distraction technique the Allies used for the Normandy Invasion. Rig up a dead body with fake invasion plans and put it onshore in such a way that the Jerries will find it and conclude the invasion will be quite a ways north. That's UEFI by the way "we are CONCERNED about your security!"
Then the real invasion comes at Normandy with the German divisions safely looking for the invasion elsewhere. The real aim of Windows is to serve you advertisement (half the "start menu" (insert derisive laughter here) is garish, Sesame Street colored tiles with sharp corners selling you stuff you don't want) and collecting information that they can use and sell for "targeted marketing."
Targeted marketing itself is nothing but a trojan horse. It is built on the premise that you don't look at anything but that which you are going to buy. And the corollary that you never buy anything that you haven't first looked at on the web. Serendipity is outlawed in their shallow way of thinking. So if you are a woman who has been suckered by clickbait into opening a page devoted to Viagra, the targeted marketers will say "she's going to buy Viagra!!!!!" And you will be subjected to Viagra ads for the next five years wherever you go on the Internet.
Are you ever going to buy Viagra? No. They are wasting their time. They are stealing money from the advertisers to whom they sell their garbage, which will actually cost them sales by making them spend their resources where there are no sales to be made.
The only way to bring this house of cards down is to refuse to buy anything from phone calls, or from ads inserted into websites by targeted marketers. Write the companies advertised and tell them what you are doing and why. "I have made a decision never to buy anything as a result of a phone call or targeted marketing on the Internet. I would have sought out and bought your product but will now seek an alternative source. Thank you very much for helping me make my purchasing decision."
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