[Long snip] In my experience it is more straightforward to install complete latex from a latex source, e.g. Texlive, than using distribution packages. If you install e.g. complete Texlive 2014 you don't have to worry about the several latex packages of you distibution, you will have everything. In this case you have to forbid installation of distribuiton latex packages disregarding dependency error warnings. An example: You have installed Texlive 2014 from Texlive source. You also want to install lyx as a distribution package. The package manager will say it needs some latex/texlive distribution packages as lyx requires them. You have to say no to those dependent packages as Texlive 2014 install has them already.
Installing Texlive 2014 from Texlive source is quite simple. The easiest way is downloading the install program according to your architecture (http://tug.org/texlive/), uncompressing, and running the install script: either in gui mode or simpe text mode. You can specify where the whole stuff should be installed, usually /usr/local/texlive. If you install Texlive you'll have apa and apa6 latex packages. Write if you need more specific help. bcsikos
