Um mal meine wenig hilfreiche Antwort von gestern wieder gut zu machen:
Code:
$ pkg which /usr/local/share/texmf-dist/tex/latex/koma-script/scrbook.cls
/usr/local/share/texmf-dist/tex/latex/koma-script/scrbook.cls was installed by package texlive-texmf-20150523_3