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I'm trying to boot ubuntu 18.04.1 from my usb slot on my Dell XPS 15, which has Windows 10 as a normal boot. I getting the following error when I try this boot:

Invalid signature detected. Check Secure Boot Policy in Setup 

This more than likely isn't an Ubuntu issue but could someone suggest a solution?
Never had this issue when I booted my XPS 13 with Ubuntu 14.04. Bios

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    New systems are UEFI. But Ubuntu should boot with UEFI Secure Boot on. Dell does often need UEFI update, if SSD that firmware needs updates and drives changed from RAID to AHCI, but add AHCI driver into Windows first. help.ubuntu.com/community/UEFI & askubuntu.com/questions/221835/… & ubuntuforums.org/showthread.php?t=2317843 – oldfred Aug 31 '18 at 16:46
  • I don't have a SSD drive, do I still need to incorporate the AHCI driver? I believe the bios can be updated, will that solve my issue? – David M Sep 3 '18 at 19:07
  • You still need the AHCI setting & Windows driver. If UEFI needs updates, keep track of UEFI settings you changed. Many may be set back to defaults and need changing again. Dell site: dell.com/support/article/us/en/19/sln301754/… – oldfred Sep 3 '18 at 19:33
  • I'm not looking for a dual boot of windows and ubuntu, just want to install ubuntu. Do I still need the ACHI driver. I apologize for initially not making that clear. – David M Sep 4 '18 at 14:20
  • Yes, the desktop version of Ubuntu does not support RAID. And I do not understand why systems with one drive are using a RAID driver, anyway? Server installer will support RAID, but then it expects multiple drives. – oldfred Sep 4 '18 at 15:23

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