Don't be sorry at all. It's these type of community engagements that assist all of us users/the community and the developers too. It's fruitful and factual.
Sorry go hear you guys having trouble booting from USB. I have had no issues from my side and that's recently installing on 3 different computers from USB. In the above argument is that regardless from what USB, he used 3 and same issue.
I do note in some forum postings here and elsewhere that Secure Boot can cause issues in the initial installation and should be disabled in BIOS/UEFI - I think Aravisian posted something in this regard not too long ago. I had to do this for one of the installations and a display driver issue with Nvidea however
Otherwise, incase you are noob like me in some instances, refer to Before you install guide before installing. 
Greetings from South Africa all. 
