Problemi inserimento figure

Ciao a tutti sono nuovo del forum e sono nuovo del mondo tex (lo uso da meno di una settimana). In particolare sto avendo problemi nell’inserire le figure in un mio documentento. Mi potete aiutare?

Ecco il mio preambolo…

\documentclass[11pt,a4paper]{article}
\includeonly{%introduction}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{figure}
\usepackage{graphicx}

Ecco come aggiungo la figura:

\begin{figure}[htpb]
\centering
\includegraphics{struttura.png}
\caption{A sketch of the chosen model}
\label{str}
\end{figure}

E questo é il listato in uscita quando compilo:

This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./truss_problem_report.tex
LaTeX2e <2015/10/01> patch level 2
Babel <3.9m> and hyphenation patterns for 79 languages loaded.
(/usr/local/texlive/2015/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/local/texlive/2015/texmf-dist/tex/latex/base/size11.clo))
Runaway argument?
{\usepackage [T1]{fontenc} \usepackage [utf8]{inputenc} \usepackage [\ETC.
! Paragraph ended before \includeonly was complete.

\par
l.8

?
(./truss_problem_report.aux (./introduction.aux)) [1{/usr/local/texlive/2015/te
xmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./introduction.tex [2]
! Undefined control sequence.
l.46 \includegraphics
*{struttura.jpeg}
?
) [3] (./truss_problem_report.aux (./introduction.aux))

LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right.

)
< /usr/local/texlive/2015/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pfb> usr/local/texlive/2015/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi6.pfb>
Output written on truss_problem_report.pdf (3 pages, 137649 bytes).
Transcript written on truss_problem_report.log.
root@eugeniodoglione:/home/eugenio/Dropbox/NMNM/reports/truss_problem# pdflatex truss_problem_report.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./truss_problem_report.tex
LaTeX2e <2015/10/01> patch level 2
Babel <3.9m> and hyphenation patterns for 79 languages loaded.
(/usr/local/texlive/2015/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/local/texlive/2015/texmf-dist/tex/latex/base/size11.clo))
Runaway argument?
{\usepackage [T1]{fontenc} \usepackage [utf8]{inputenc} \usepackage [\ETC.
! Paragraph ended before \includeonly was complete.

\par
l.8

?
(./truss_problem_report.aux (./introduction.aux)) [1{/usr/local/texlive/2015/te
xmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./introduction.tex [2]
! Undefined control sequence.
l.46 \includegraphics
{struttura.png}
?
) [3] (./truss_problem_report.aux (./introduction.aux)) )
Output written on truss_problem_report.pdf (3 pages, 137407 bytes).
Transcript written on truss_problem_report.log.

Premetto che sto usando latex con ubuntu 15.10, texlive è stato installato a regola d’arte tramite guida fornita su GUIT. Prima di scrivere sul forum mi sono sufficientemente spaccato la testa saccheggiando le varie documentazioni disponibili ma proprio non riesco a trovare l’errore. Qualcuno può aiutarmi?

Saluti 🙂