I can not install Linux ubuntu, during installation it gives an error, what's the problem?

Question

linux

I made a bootable USB flash drive through the unetbootin program, previously formatted the USB flash drive through Rufus. Then I downloaded Ubuntu, installed it on the laptop and rebooted. I pulled out a usb flash drive and my system crashed, in general I did the same way two times. The result now, if I put priority on hdd, writes that there is no device, if I put usb priority.
I tried to download the distribution kit both from the site and in the unetbootin program itself, there I chose Linux ubuntu in the list and he downloaded and uploaded it to a USB flash drive, the result is the same, now when I start the flash drive, the laptop gives an error and turns off after a couple of seconds
PS: I can’t attach a photo, gives an error)
tried, the error is the same:

Failed to open \EFI\BOOT\mmx64.efi -Not Found 
Failed to load image \EFI\BOOT\mmx64.efi: Not Found
Failed to start MokManager: Not Found
Something has gone seriously wrong: import_mok_state() failed
: Not Found

I can't attach a picture, so I posted it. She crawls out from the top left, on a black screen, then the laptop is cut down

Answer 1

You don't need to install Linux. Waste your time.
We are waiting for the description of the error.

Answer 2

most likely you did not install the bootloader there

this is done when partitioning the disk

Answer 3

try the program from linux rosa to burn ubuntu to a USB flash drive

Answer 4

Install Balena Etcher on Windows and burn the distribution ISO through it to a fresh drive (by the way, this utility is also available for Linux).