Upgrading to 15.04

[Richard Barmann]

When my screen said an upgrade was available I ran the 15.04 upgrade and 
get to the login screen. At that point I get a black screen with just my 
curser activated. on the way to boot up I get this message:
----------------
1.4178621 ACPC PROBE FAILED
Starting Version 219
____________
I also burned an iso and tried to install it but that did not work.Is 
there a way (that I can understand) to back up and try to reinstall the 
version 15.04?
If I knew how to remove it I would wait until April 15 (I think that is 
the date) and start over.
Thank you for any help. I have been using Kubuntu for several years as 
barmannsbar.com but the Domain name was in my friends name and after he 
died it expired and I did not know it. Trying to straighten that out also.

Dick Barmann