2015-05-06, 08:30
I had the same issue with 14.1 x86 not installing when I was trying to roll it back. I managed to get 14.1 x86 to install after a ful NP reset.
Later I did another full NP reset, and have installed 14.2 x86 fine again.
Later I did another full NP reset, and have installed 14.2 x86 fine again.