Error message should say `install pypandoc` not `install pandoc`

Nobody has claimed this yet.

**Describe the bug**
convert to pdf fails

**To Reproduce**

1. Go to Dile/Download as
1. Click on 'PDF via LaTeX'

**Expected behavior**
A pdf file

**Screenshots**
```
Please check that pandoc is installed:
https://pandoc.org/installing.html
Traceback (most recent call last):
File "/home/alex/Python/lib/python3.11/site-packages/notebook/nbconvert/handlers.py", line 129, in get
output, resources = exporter.from_notebook_node(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/exporters/pdf.py", line 186, in from_notebook_node
latex, resources = super().from_notebook_node(nb, resources=resources, **kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/exporters/latex.py", line 76, in from_notebook_node
return super().from_notebook_node(nb, resources, **kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/exporters/templateexporter.py", line 421, in from_notebook_node
output = self.template.render(nb=nb_copy, resources=resources)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/jinja2/environment.py", line 1301, in render
self.environment.handle_exception()
File "/home/alex/Python/lib/python3.11/site-packages/jinja2/environment.py", line 936, in handle_exception
raise rewrite_traceback_stack(source=source)
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/index.tex.j2", line 8, in top-level template code
((* extends cell_style *))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/style_jupyter.tex.j2", line 176, in top-level template code
\prompt{(((prompt)))}{(((prompt_color)))}{(((execution_count)))}{(((extra_space)))}
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/base.tex.j2", line 7, in top-level template code
((*- extends 'document_contents.tex.j2' -*))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/document_contents.tex.j2", line 51, in top-level template code
((*- block figure scoped -*))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/display_priority.j2", line 5, in top-level template code
((*- extends 'null.j2' -*))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/null.j2", line 30, in top-level template code
((*- block body -*))
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/base.tex.j2", line 215, in block 'body'
((( super() )))
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/null.j2", line 32, in block 'body'
((*- block any_cell scoped -*))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/null.j2", line 85, in block 'any_cell'
((*- block markdowncell scoped-*)) ((*- endblock markdowncell -*))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/share/jupyter/nbconvert/templates/latex/document_contents.tex.j2", line 68, in block 'markdowncell'
((( cell.source | citation2latex | strip_files_prefix | convert_pandoc('markdown+tex_math_double_backslash', 'json',extra_args=[]) | resolve_references | convert_pandoc('json','latex'))))
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/filters/pandoc.py", line 25, in convert_pandoc
return pandoc(source, from_format, to_format, extra_args=extra_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/utils/pandoc.py", line 51, in pandoc
check_pandoc_version()
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/utils/pandoc.py", line 99, in check_pandoc_version
v = get_pandoc_version()
^^^^^^^^^^^^^^^^^^^^
File "/home/alex/Python/lib/python3.11/site-packages/nbconvert/utils/pandoc.py", line 76, in get_pandoc_version
raise PandocMissing()
nbconvert.utils.pandoc.PandocMissing: Pandoc wasn't found.
Please check that pandoc is installed:
https://pandoc.org/installing.html
[W 20:09:18.459 NotebookApp] 500 GET /nbconvert/pdf/Zhou.ipynb?download=true (127.0.0.1): nbconvert failed: Pandoc wasn't found.
Please check that pandoc is installed:
https://pandoc.org/installing.html
[E 20:09:18.462 NotebookApp] {
"Host": "localhost:8889",
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
"Referer": "http://localhost:8889/notebooks/Xxx.ipynb",
"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0"
}
```

`pandoc`, however, is installed.

May I suggest to advise users that the package needed is `pypandoc`?
This makes things a lot easier to fix when it fails.
(This is what I do in my codes.)

When this is done, I still get broken LaTeX code:

```

500 : Internal Server Error

The error was:

nbconvert failed: PDF creating failed, captured latex output:
Failed to run "['xelatex', 'notebook.tex', '-quiet']" command:
This is XeTeX, Version 3.141592653-2.6-0.999993 (TeX Live 2021) (preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
(./notebook.tex
LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-05-07>
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size11.clo))
(/usr/share/texlive/texmf-dist/tex/latex/tcolorbox/tcolorbox.sty
(/usr/share/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgf.sty
(/usr/share/texlive/texmf-dist/tex/latex/pgf/utilities/pgfrcs.sty
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common-lists.t
ex)) (/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-latex.def
) (/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfrcs.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/pgf.revision.tex)))
(/usr/share/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgfcore.sty
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(/usr/share/texlive/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-def/xetex.def)))
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f))))
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tex)
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)
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x)
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)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreimage.code.tex

(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreexternal.code.
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(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorelayers.code.te
x)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransparency.c
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tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorerdf.code.tex))
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleshapes.code.tex
) (/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleplot.code.tex
)
(/usr/share/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-0-65
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(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
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))) (/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec-xetex.sty
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(/usr/share/texlive/texmf-dist/tex/generic/xkeyval/xkvutils.tex)))
(/usr/share/texlive/texmf-dist/tex/latex/adjustbox/adjcalc.sty)
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(/usr/share/texlive/texmf-dist/tex/latex/adjustbox/tc-xetex.def))
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(/usr/share/texlive/texmf-dist/tex/generic/bitset/bitset.sty
(/usr/share/texlive/texmf-dist/tex/generic/bigintcalc/bigintcalc.sty))
(/usr/share/texlive/texmf-dist/tex/latex/base/atbegshi-ltx.sty))
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/hxetex.def
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(/usr/share/texlive/texmf-dist/tex/latex/rerunfilecheck/rerunfilecheck.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/atveryend-ltx.sty)
(/usr/share/texlive/texmf-dist/tex/generic/uniquecounter/uniquecounter.sty)))
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(/usr/share/texlive/texmf-dist/tex/generic/ulem/ulem.sty)
(/usr/share/texlive/texmf-dist/tex/latex/jknapltx/mathrsfs.sty)
No file notebook.aux.
(/usr/share/texlive/texmf-dist/tex/latex/caption/ltcaption.sty)
*geometry* driver: auto-detecting
*geometry* detected driver: xetex
*geometry* verbose mode - [ preamble ] result:
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* (1in=72.27pt=25.4mm, 1cm=28.453pt)

(/usr/share/texlive/texmf-dist/tex/latex/hyperref/nameref.sty
(/usr/share/texlive/texmf-dist/tex/latex/refcount/refcount.sty)
(/usr/share/texlive/texmf-dist/tex/generic/gettitlestring/gettitlestring.sty))

Package hyperref Warning: Rerun to get /PageLabels entry.

(/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsa.fd)
(/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsb.fd)
(/usr/share/texlive/texmf-dist/tex/latex/jknapltx/ursfs.fd)

LaTeX Warning: No \author given.

! Missing $ inserted.

$
l.403 \$\frac{d^2\phi}{d\zeta^2}
+\frac{2}{\zeta}\frac{d\phi}{d\zeta} +
?
! Emergency stop.

$
l.403 \$\frac{d^2\phi}{d\zeta^2}
+\frac{2}{\zeta}\frac{d\phi}{d\zeta} +
No pages of output.
Transcript written on notebook.log.
```

**Desktop (please complete the following information):**

- OS: Fedora 37
- Browser Firefox (or Chrome, both the same issue)
- Version 110

**Additional context**
Are there specific version of LaTeX needed? The problem seems generic, though.

Start with nbconvert/utils/pandoc.py, especially the PandocMissing error and check_pandoc_version path shown in the traceback. Reproduce the PDF conversion failure and determine the appropriate installation guidance; done means the missing-dependency message names the package requested by the issue and the conversion-related tests still pass.

Written by the indexing model from the issue text.