Hi there, I've been using Neon off and on since 2016 and loved it when it worked. Each time after certain upgrades, they broke my system on both my desktop and laptop, so I had to go back to Mint. I recently bought a brand new computer and said I would try Neon again. I used it first with the Live usb and it worked fine but the internal speakers wouldnt work. I assumed that once I installed it would probably work but it didnt. So I installed Kubuntu over it and still the same. So I plugged in my external speakers and the sound came thru on Kubuntu but I didnt like the way Kubuntu looked. It wasnt as polished looking as Neon so I went back to install Neon but now, the install got stuck at the grub installation and gave me an error. I went back and put Neon on another usb and tried to reinstall and the same thing happened. So I went back to the site and downloaded neon again and still got stuck at grub. So I just put the regular Ubuntu 18.04 on and it went smoothly. Can someone tell me what happened and how to resolve it. I really like Neon better but I am afraid that this is an omen telling me that it will still mess up my new pc. Why does Neon always do this? I used Kubuntu a year ago for about 3 mths and I never had a problem. I just like the way Neon looks.

Ubuntu, Mint, KDE Neon are in fact the same thing, the version may differ, Neon uses the latest Ubuntu Lts, I think Mint too.
So it's quite strange that one works and the other doesn't! Are you sure the USB stick is intact? Have you checked the verification code?

I dont know about a verification code is but I installed it successfully the first time but the 2nd time, it got stuck in the grub installation part.

By verification code he means did you check the signature of the ISO you downloaded, this should always be done before using a downloaded iso file.