Unbuntu installation with "not a com32r image"

My PC is DELL PC, when install with the a USB installation media, the following message appears on the screen:
missing parameter in configuration file. 
 Keyword: path gfxboot.c32: not a com32R image
boot:
and this message repeats again and again.

Many document in the internet says :
Press TAB when that happens (when you boot and the error message appears) and then you will be able to choose between options (live, live-install, ...). Type live, press ENTER and it will boot you into the live try from there you can install.


But for my case it is not, when  pressing TAB, it will give another error message.

Then I try this way, quite strange , it works.

try typing "help" and pressing enter. That should take you to the Help menu. Now, hit enter again to exit and it should boot correctly.


Now I am trying to understand why this can help.