I am using Fedora 23 operating system with TeXLive version 2014.19.20140525_r34255.fc23
I downloaded llncs2e.zip then I unpacked the llncs2e folder content inside
/usr/share/texlive/texmf-dist/tex/latex/llncs2e
but it seems to not work. Here the full TeX test document
\documentstyle{llncs}
%
\begin{document}
\title{TEST TITLE}
\author{Foo}
\institute{Foo}
\maketitle
\begin{abstract}
Foo
\end{abstract}
\section{Introduction}
Foo
\end{document}
I also tried to add on top
\usepackage{llncs}
/usr/share/texlive/texmf-dist, but in the tree you get as output fromkpsewhich -var-value TEXMFLOCAL– egreg Apr 22 '16 at 10:40