The kernel does not initiate correctly

Hi, I have tried many, many times to boot my Raspberry Pi 3 Plus with Ubuntu and I fail. I am uploading a screen shot to illustrate where the problem is (at the very beginning). Could you help me to understand what the error is? Thank you.

I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the Finding Help page.