I am trying to reinstall Jessie from the Debian Trinity Repo

I added:

deb http://mirror.ppa.trinitydesktop.org/trinity/trinity-r14.0.0/debian jessie main
deb http://mirror.ppa.trinitydesktop.org/trinity/trinity-builddeps-r14.0.0/debian jessie main

to : /etc/apt/sources.list file

I ran:

#  apt-key adv --keyserver keyserver.quickbuild.pearsoncomputing.net --recv-keys F5CFC95C

in a root console.

I then ran:

#  apt-get update

from the same root console, and after it finished reading everything in the package list, I got this error message TWICE in a row:

W: GPG error: http://mirror.ppa.trinitydesktop.org jessie Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 96C95152F5CFC95C