install ubuntu on a uefi system

Case in point: Dell Inspiron 13 7000

1.
https://itsfoss.com/install-ubuntu-1404-dual-boot-mode-windows-8-81-uefi/

2.
https://itsfoss.com/disable-uefi-secure-boot-in-windows-8/

3.
How-to-install-Ubuntu-on-Dell-Inspiron-15-7000

https://www.tenforums.com/drivers-hardware/15006-attn-ssd-owners-enabling-ahci-mode-after-windows-10-installation.html