After "Preparing mouth file system", the screensaver Ubuntu Nexus have a black screen. What to do?
I came across the same problem and am starting the whole process again.
This is what I'm doing differently: Make sure you don't run the installer 2x by accident (I don't remember running it twice, but apparently I did). Make sure you give it enough time to finish unpacking (10-20min).
I hope this works :)