If Windows is UEFI, you really want Ubuntu booting in UEFI boot mode.
And how you boot install media is then how it installs. So you need to boot install media in UEFI boot mode.
Only a few systems seem to let you boot in UEFI mode with Legacy enabled. Most then only boot in Legacy/CSM/BIOS boot mode.
What version of Ubuntu, you may need the very newest and even then perhaps a newer kernel & drivers as you have very new hardware.
Ubuntu 18.04 with updates from ppas
Ryzen 7 2700 / Ryzen 7 2700X / Core i7 8700K Linux Gaming Performance With RX Vega 64, GTX 1080 Ti
https://www.phoronix.com/scan.php?pa...0-gaming&num=1
Asus B350M-A needs newer kernel that 18.04 default
https://ubuntuforums.org/showthread.php?t=2391892
https://ubuntuforums.org/showthread....6#post13799816
Only if willing to experiment, you can try the new Disco Dingo. Just installed a couple of hours ago after they fixed an issue with installer & it looks like it has 4.18 kernel. But my system is now a couple of years old which is the sweet spot for Linux as just about every little issue has been fixed.
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