# mhchem wants expl3 [closed]

I am on Ubuntu using TexLive and I cannot compile this .tex file:

\documentclass[
letter,
12pt         %% set default font size to 12 point
]{scrartcl}  %% article, see KOMA documentation (scrguide.dvi)

%just have this
%\usepackage{ucs} breaks biblatex?
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage[american]{babel}

\usepackage[autostyle]{csquotes}

\usepackage[
backend=biber,
style=authoryear-icomp,
sortlocale=de_DE,
natbib=true,
url=false,
doi=true,
eprint=false
]{biblatex}

\hypersetup{
}

\usepackage{amsmath,amssymb,amstext}

\usepackage{graphicx}

\usepackage{siunitx}

%\usepackage{expl3} % i thought i might have to include it

\usepackage[version=4]{mhchem}      %chemical notation

\title{Not very minimal Example}
\author{Test Name}
\date{}

\begin{document}
\maketitle

\tableofcontents

Test

\printbibliography

\end{document}


I when remove the mhchem package it works, but I need it for my lab report.

With the mhchem package I get following message:

/texmf/tex/latex/l3kernel/l3str.sty
*****************************************************************
**
** Package l3str is obsolete and has been removed!
**
** Its functionality is now only provided as part of in the expl3 package
**
** After showing you an error message you can hit <return> we will continue
** for now by loading expl3 for you. However, at some point in the future
** the old packages will be removed.
**
** with '\usepackage{expl3}' in your documents as soon as possible.
**
*******************************************************************

! Package l3str Error: This package is obsolete --- use 'expl3' instead.

See the l3str package documentation for explanation.
Type  H <return>  for immediate help.
...



It don't really know how to fix that. I tried following things:

• remove/install l3kernel
• compile it on a Windows machine with TeXStudio (works there!)
• googling arround, not understanding what could be the problem

The fact that it works on Windows should tell me that my latex installation is somehow not setup correctly and I might have to install some other packege? (via tlmgr)

I hope somebody can help me, I like latex a lot but it's very intimidating at first. :)

## closed as off-topic by TeXnician, Phelype Oleinik, user31729, barbara beeton, Stefan PinnowMar 27 '18 at 12:49

• This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

• On an up-to-date TeX Live system you should be fine. What exactly do you have installed? – Joseph Wright Jan 24 '16 at 17:43
• I've noticed that ubuntu quite often lags behind the latest TeX Live. Did you install your TeX distribution through ubuntu's software manager or did you directly install TeX Live (e.g from DVD or download from TUG)? – Nicola Talbot Jan 24 '16 at 18:09
• So - I honestly don't remember - it was a couple of months back and I do not want to tell you some speculation how I did it back then.. Is there a way to find out what exactly is installed? – Domsl Jan 24 '16 at 18:29
• Don't just uninstall them. You need to also supply a dummy package to take care of dependencies. See this question and answers for details of how to do this on Debian/Ubuntu. (Not hard to adapt to other GNU/Linux distros, but the focus is on Debian-based systems.) – cfr Jan 24 '16 at 20:19
• I'm voting to close this question as off-topic because the error was caused by outdated packages. – TeXnician Mar 27 '18 at 12:15