Sensational!!! It worked!!! Man you hitted it.Try again with Balena Etcher. Rufus has caused issues with a number of folks lately.
Also, before you write the .iso to the USB drive, be sure to verify it.
But now, another thing.. I installed Linux but after restarted the system and no grub appeared, Windows started alone.Glad you got it sorted. Rufus and UNetbootin are two that I recommend folks avoid for the time being. They've both had show-stopping bugs in the recent past and you're better off avoiding either of them.
Well i did it so. But the grub didn't appear and again windows started alone. Its frustrating. I am still waiting LG support.I'd boot to the live USB, install grub-repair, run it, and then you're usually safe to use the recommended repair option.