Clean Install Windows 10 and Ubuntu - Dualboot

I have a Dell XPS 13 (9343) laptop with windows 10 installed.
I would like to format my hard drive and create a dualboot with Ubuntu 16.04 and Windows 10.

I saw few guides but they are not very equal.
First, some states that if I want to have dualboot it should be better to install Ubuntu first:
http://askubuntu.com/questions/6666...nd-ubuntu-on-a-uefi-hp-notebook/666632#666632
While others say to install Windows first and then to install Ubuntu:
http://www.tecmint.com/install-ubuntu-16-04-alongside-with-windows-10-or-8-in-dual-boot/

Second, the BIOS configuration are not the same in those guids. I also looked at the guides that were posted here:
http://forum.notebookreview.com/thr...windows-10-after-m-2-nvme-ssd-upgrade.787420/
http://forum.notebookreview.com/threads/nbr-windows-10-clean-installation-guide.781178/

Will appreciate if someone can guide me what should I do? Maybe there are some pros and cons for each guide?

Thanks.

 

Not sure why you want to reinstall Windows 10. To get both systems running, using the Windows based Ubuntu installer would be the easiest way. It will piggyback off the existing Windows boot loader so all you need to do is ensuring there's an empty partition it can install to.

If you do need to wipe the existing Windows instance, or prefer to have no dependence between the two systems, the order of install usually doesn't matter as long as you're using UEFI, as the BIOS would save reference to both separately. I would install Windows before Ubuntu if I have the choice because the Ubuntu installer is definitely made with existing non-Linux systems in mind while the Windows installer may or may not step on Ubuntu's boot information.

 

Keep Boot repair ISO burned to usb/cd. Disable Secure Boot, assuming you've created UEFI compatible version of Ubuntu using Rufus or YUMI UEFI etc, boot up in UEFI USB mode and install normally as you always do. Install Win first and then other Linux OSes this way grub can update Windows loader w/o breaking and windows tends to break grub. If you don't like Ubuntu boot up Boot repair and choose OS uninstaller from System Menu and you'll uninstall all remnants of the OS w/ a clean boot screen.

 

Thanks @Mr.Koala and @Vasudev,

I want to reinstall Windows because I have lots of junk in my laptop and I want to clean everything out and start like new.
So as I understand I only need to make sure that I disabled Secure Boot.
Then, I can stick with this guide for installing windows:
http://forum.notebookreview.com/threads/nbr-windows-10-clean-installation-guide.781178/
And after windows is installed, I can follow this guide to install Ubuntu:
http://www.tecmint.com/install-ubuntu-16-04-alongside-with-windows-10-or-8-in-dual-boot/

Thanks.

 

Just make sure to re-enable Secure Boot on windows 10/Linux to get lighting fast startup speed.