https://askubuntu.com/questions/1031993/how-to-install-ubuntu-18-04-alongside-windows-10
https://www.linuxtechi.com/dual-boot-ubuntu-18-04-lts-with-windows-10/
Dual boot on Dell
https://www.dell.com/support/article/us/en/04/sln301754/how-to-install-ubuntu-and-windows-8-or-10-as-a-dual-boot-on-your-dell-pc?lang=en#Hard_Ware