Running Ubuntu via live USB error on Dell XPS 15 9560

I have been running Windows 10 pro on a Dell XPS 15 (9560) for some time and would like to dual boot ubuntu. I created an install disk with 18.04 and got similar errors to what are shown below, so I then created a bootable disk using rufus 3.0 with version 16.04 on it hoping this would solve the errors I was getting. I prepared the bios and computer using the very thorough instructions found at https://github.com/rcasero/doc/wiki/Ubuntu-linux-on-Dell-XPS-15-(9560). I get to the GRUB and select the first option, something like "Try Ubuntu without install". When I select this option, the following errors come up:

[   0.037972] ACPI Error:  [\_SB_.PCI0.XHC_.RHUB.HS11] Namespace lookup failure,
 AE_NOT_FOUND  (20170531/dswload-210)
[   0.037979] ACPI Exception: AE_NOT_FOUND, During name lookup/catalog (2017053
1/psobject-252)
[   0.038014] ACPI Exception: AE_NOT_FOUND, (SSDT:xh:rvp11) while loading table
 (20170531/tbxf load-228)
[   0.040866] ACPI Error: 1 table load failures, 12 successful (20170531/tbxf lo
ad-246)
[   12.764409] usb 2-2: device descriptor read/8, error -110
[   18.140497] usb 2-2: device descriptor read/8, error -110
[   21.432576] sd 2:0:0:0: [sda] No Caching mode page found
[   21.432603] sd 2:0:0:0: [sda] Assuming drive cache: write through
[   48.096001] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [plymouthd:298]
[   76.096001] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [plymouthd:298]
[   81.432001] INFO: rcu_sched self-detected stall on CPU
[   81.432038] #0-...: (14999 ticks this GP) idle=e6a/140000000000001/0 softirq=447/447 fqs=7499
[   81.430261] # (t=15000 jiffies g=180 c=181 q=350)

I am not sure what I am doing wrong. I am very new to Ubuntu, I used it some in the past about 6 years ago. I am by no means an advanced user, and have run into quite a bit of trouble trying to install it. Thanks for any help you may be able to offer!

It appears that the 'nomodeset' trick does the trick! I have now installed Ubuntu 18.04 successfully onto the Dell XPS 15 and it is working fine!

If the bootable USB is set up correctly, and the install/live trial is freezing after the GRUB, then try the following 'nomodeset' trick, as explained in this link provided by pHeLiOn:

http://www.dell.com/support/article/uk/en/ukbsdt1/sln306327/manual-nomodeset-kernal-boot-line-option-for-linux-booting?lang=en