TeX Live issues

[Marco van Hulten]

Hi there—

I am unable to use LaTeX and friends.  I get this error:

```
$ cat apen.tex 
\documentclass{article}
\author{Marco}
\title{Een titel}

\begin{document}
\maketitle
Wat een rare jongens!
\end{document}
$ latex apen
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded 
format=latex)
 restricted \write18 enabled.
entering extended mode
(./apen.tex
LaTeX2e <2018-04-01> patch level 2
Babel <3.18> and hyphenation patterns for 84 language(s) loaded.

! LaTeX Error: File `article.cls' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: cls)

Enter file name: 
```

I am using the big texlive@20180414 package.  Is this a known issue?

Can I do something to test the more modular set-up of TeX Live?

—Marco