shim圆4.efi is used when Secure Boot is enabled and grub圆4.efi is used when SB is disabled. P S - I think the Live Linux USB/DVD uses Windows Boot Manager or the boot圆4.efi file for booting(= no problem booting with Secure Boot enabled) but uses its own bootloader file(= grub圆4.efi or shim圆4.efi) for the install.
(One possible workaround to this problem is to copy GRUB from EFI/ubuntu/grub圆4.efi to EFI/BOOT/boot圆4.efi = create a new folder, BOOT, in the EFI folder and rename grub圆4.efi to boot圆4.efi. So, better to disable Secure Boot when installing LM or Ubuntu or Fedora.
This online registration or signing process can often be incomplete or interrupted or "sabotaged", eg grub圆4.efi-signed not downloaded during the install process. M$'s Secure Boot still requires a certified bootloader to be first registered or loaded in UEFI-BIOS firmware through the Internet before the software/OS can be booted or installed successfully. Tech-geeks can also register the bootloaders in the firmware of their own UEFI computers themselves, ie no need to be first certified by M$'s Verisign for their own computers with Secure Boot enabled. The bootloaders of Ubuntu, LM and Fedora have this certification from Verisign. This certification process costs about US$100 per year. Other bootloaders, eg Linux Mint's grub圆4.efi or shim圆4.efi file, bootable GParted CD, bootable Hiren's BootCD, etc, need to be first certified or approved by the M$-associated Verisign company before they can be registered in the firmware and be booted. Any personalization can be done in your windows settings.for UEFI computers and Secure Boot, the OEMs are required by M$ to pre-register or preload the EFI-Windows Boot Manager or boot圆4.efi file in the UEFI-BIOS firmware(= in the NVRAM = a flash memory chip) for all their new Win 8.x/10 computers = Win 8.x/10 and their Recovery USB/DVD can always be booted and/or installed successfully with Secure Boot enabled. When we convert to MPP, we don't need any software. Then, press the shortcut button for 3 seconds for the bottom LED light to flash. If it blinked once, we need to press the two buttons and hold them again for 2 sec to change it to MPP. When you press them both at the same time for 2 sec, you should see one blink or two blinks. There is a LED light in the MIDDLE of those two buttons (can barely see it). Before pairing your pen, click on the top and bottom barrel at the same time for 2 seconds. It wasn't working and I got the same error message. He has never even heard of this pen until today.
My family friend (genius!!) helped me with all the issues in 30 min. I was told I have to pay $90 for support. Even the supervisor don't know what happened. I'm like I called the same number though.
The other guy said he shouldn't have done it for free and that he might be a scammer. One guy hung up on me after more than an hour and ended the screen share session abruptly.
I FOUND THE SOLUTION!!! I talked to two dell reps for 2 hours and neither of them knew how to do it.