Copy the files in one of the latex directories, e.g. /usr/share/texmf/tex/latex/lyx/, then run texhash, then reconfigure lyx. The first two steps have to be done as root.
Copy the files in one of the latex directories, e.g. /usr/share/ texmf/tex/ latex/lyx/ , then run texhash, then reconfigure lyx. The first two steps have to be done as root.