Hi,
I' had a little bit effort to update jack2 for ubuntu 14.4.
With the help of the community, I was able to make it happen.
But for users, they don't have this possibility, it maybe good, when
some tutorials more for installing/updating are available.
My proposal is this.
http://joergsorge.de/blog/?p=9
Perhaps,
jackaudio.org can have more informations for newbies about that?
Regards,
Jörg