Comment 10 for bug 1517884

Well not a fix, but a workaround for those of you struggling, simply add the trusty repository, install libxp6, then remove it...

create:

/etc/apt/sources.list.d/libxp-source.list

as:

# Used to install libxp6 for chemkin and ansys to work
deb http://us.archive.ubuntu.com/ubuntu trusty main universe

apt-get update
apt-get install libxp6

Then comment out the repository line and

apt-get clean all

No updates, etc, but you get the library you need for now.