I've been able to install (X)ubuntu 15.10 on the XPS 13 9350 but I'm having issues with it working with Secure Boot enabled. 

When Secure Boot is enabled, I get dropped to initramfs after splash screen.

Can anyone provide a detailed step by step to install 15.10  properly?

Some things that I've had to consider:

Fast Boot, SRT, Home Partition Encryption