\documentclass{article}
\usepackage[german]{babel}
\usepackage{multicol}
\usepackage{lineno}
\usepackage{blindtext}
\begin{document}
\setlength{\columnsep}{30pt}
\begin{multicols}{2}
\linenumbers\Blindtext
\end{multicols}

\linenumbers\Blindtext
\end{document}