xetex polyglossia arabic : compilation issue

Question

I need help for what seems to me a configuration problem. I try to compile a document with both arabic and french languages using xetex and polyglossia. I was used to it with my former installation but I had to switch to an other version of ubuntu because the 12.04 LTS will be no more supported in April 2017 and I don't remember at all how I managed to do it formerly...

I have made a minimal file :

\documentclass[a4paper]{book}
\usepackage{fontspec}
\newfontfamily\arabicfont[Script=Arabic]{Scheherazade}
\usepackage{polyglossia}
\setdefaultlanguage{french}
\setotherlanguage{arabic}
\usepackage{csquotes}
\begin{document}
bla\\
\textarabic{ليققسسقل}
\end{document}

It does not produce a pdf and I don't have any error message, just a warning for which I do not find any answer (here or here):

Package csquotes Warning: Using preliminary 'polyglossia' interface.
(csquotes)                Some of the multilingual features may not
(csquotes)                work as expected.

The end of the log file is :

Error 256 (driver return code) generating output; file xelatex_minimal.pdf may not be valid.

I do not find any helpfull documention on this Error 256 (driver return code) but it seems to me that it may point to a installation problem or a configuration problem in Texmaker.

If I don't put the line with setarabic{...} it works so I think I have installed correctly texlive 2016. I am using texmaker 4.5.

I am not sure to have installed correctly the Scherazade font, but it seems to me that the log file does not make a big deal about this :

\g__fontspec_family_Scheherazade_int=\count122
.................................................
. fontspec info: "no-font-shape"
. 
. Could not resolve font Scheherazade/I (it probably doesn't exist).
.................................................
.................................................
. fontspec info: "defining-font"
. 
. Font family 'Scheherazade(0)' created for font 'Scheherazade' with options 
. [Script=Arabic]. 
.  
. This font family consists of the following NFSS series/shapes:
. - 'normal' (m/n) with NFSS spec.:
. <->"Scheherazade/OT:script=arab;language=DFLT;"
. - 'small caps'  (m/sc) with NFSS spec.: - 'bold' (bx/n) with NFSS spec.:
. <->"Scheherazade/B/OT:script=arab;language=DFLT;"
. - 'bold small caps'  (bx/sc) with NFSS spec.: - 'bold italic' (bx/it) with
. NFSS spec.: <->"Scheherazade/BI/OT:script=arab;language=DFLT;"
. - 'bold italic small caps'  (bx/itsc) with NFSS spec.: 

Thanks for your help, I am really looking forward rebuild the set up of my biblio this week!

Edit : I am really sorry @UlrikeFischer for mispelling your name I do apologize.

The log file I have obtained is too long, here is the end of it dealing with polyglossia (I do not understand how I can properly cite this log file)

 Redefining command \oldstylenums with sig. 'm' on line 2841.
   LaTeX info: "xparse/define-command"
  . Defining command \liningnums with sig. 'm' on line 2845. ))
  Requested font "Scheherazade/OT" at 10.0pt
  -> 
  \g__fontspec_family_Scheherazade_int=\count122
  Requested font "Scheherazade/BI/OT" at 10.0pt
  -> 
  Requested font "Scheherazade/B/OT" at 10.0pt
   -> 
   Requested font "Scheherazade/I/OT" at 10.0pt
    -> ^^0?,^^B
      .................................................
  . fontspec info: "no-font-shape"
   . 
  . Could not resolve font Scheherazade/I (it probably doesn't exist).
   .................................................
  Requested font "Scheherazade/B/OT" at 10.0pt
      -> ^^ 5,^^B
 Requested font "Scheherazade/B/OT" at 10.0pt
   -> ^^P@,^^B
    Requested font "Scheherazade/BI/OT" at 10.0pt
  -> ^^>,^^B
   Requested font "Scheherazade/BI/OT" at 10.0pt
    -> ^^>,^^B
    .................................................
  . fontspec info: "defining-font"
    . 
  . Font family 'Scheherazade(0)' created for font 'Scheherazade' with options
 . [Script=Arabic].
    . 
   . This font family consists of the following NFSS series/shapes:
   . - 'normal' (m/n) with NFSS spec.:
   . <->"Scheherazade/OT:script=arab;language=DFLT;"
   . - 'small caps'  (m/sc) with NFSS spec.: - 'bold' (bx/n) with NFSS spec.:
    . <->"Scheherazade/B/OT:script=arab;language=DFLT;"
   . - 'bold small caps'  (bx/sc) with NFSS spec.: - 'bold italic' (bx/it) with
   . NFSS spec.: <->"Scheherazade/BI/OT:script=arab;language=DFLT;"
   . - 'bold italic small caps'  (bx/itsc) with NFSS spec.: 
   .................................................
  /usr/share/texlive/texmf-dist/tex/latex/polyglossia/polyglossia.sty
    Package: polyglossia 2015/08/06 v1.42.0 Alternative to Babel for XeLaTeX and LuaLaTeX
  (/usr/share/texlive/texmf-dist/tex/latex/etoolbox/etoolbox.sty
      Package: etoolbox 2015/08/02 v2.2a e-TeX tools for LaTeX (JAW)
       \etb@tempcnta=\count123
         )
               (/usr/share/texlive/texmf-dist/tex/latex/makecmds/makecmds.sty
              Package: makecmds 2009/09/03 v1.0a extra command making commands
               )
                               (/usr/share/texlive/texmf-dist/tex/latex/xkeyval/xkeyval.sty
                       Package: xkeyval 2014/12/03 v2.7a package option processing (HA)
          (/usr/share/texlive/texmf-dist/tex/generic/xkeyval/xkeyval.tex
          (/usr/share/texlive/texmf-dist/tex/generic/xkeyval/xkvutils.tex
 \XKV@toks=\toks17
 \XKV@tempa@toks=\toks18
 )
 \XKV@depth=\count124
  File: xkeyval.tex 2014/12/03 v2.7a key=value parser (HA)
 ))
 (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifluatex.sty
  Package: ifluatex 2010/03/01 v1.3 Provides the ifluatex switch (HO)
  Package ifluatex Info: LuaTeX not detected.
  )
   (/usr/share/texlive/texmf-dist/tex/generic/ifxetex/ifxetex.sty
  Package: ifxetex 2010/09/12 v0.6 Provides ifxetex conditional
 )
   \xpg@normalclass=\XeTeXcharclass1
 )
 (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/gloss-french.ldf
  File: gloss-french.ldf polyglossia: module for french
 \french@punctthin=\XeTeXcharclass2
\french@punctthick=\XeTeXcharclass3
 \french@punctguillstart=\XeTeXcharclass4
 \french@punctguillend=\XeTeXcharclass5 
 )
    Package polyglossia Info: Default language is french.
    (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/gloss-arabic.ldf
     File: gloss-arabic.ldf polyglossia: module for arabic
  (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/bidi.sty
 Package: bidi 2015/12/07 v19.1 Bidirectional typesetting in plain TeX and  LaTeX
   ****************************************************
   * 
  * bidi package (Bidirectional typesetting in
  * plain TeX and LaTeX, using XeTeX engine)
 * 
  * Description: A convenient interface for
  * typesetting bidirectional texts in plain TeX
 * and LaTeX. The package includes adaptations
 * for use with many other commonly-used packages.
 * 
  * Copyright (c) 2009--2015 Vafa Khalighi
  * 
 * 2015/12/07, v19.1
 * 
 * License: LaTeX Project Public License, version
 * 1.3c or higher (your choice)
 * 
 * Location on CTAN: /macros/xetex/latex/bidi
  * 
 * Issue tracker: https://github.com/persian-tex/bidi/issues 
  * 
  * Support: [email protected]
  ****************************************************
 (/usr/share/texlive/texmf-dist/tex/generic/iftex/iftex.sty
 Package: iftex 2013/04/04 v0.2 Provides if(tex) conditional for PDFTeX, XeTeX, and LuaTeX
  )
  (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/biditools.sty
  Package: biditools 2015/11/14 v0.8 Programming tools for bidi package
  \@bidi@envbody=\toks19
 \@bidi@emptytoks=\toks20
 )
   (/usr/share/texlive/texmf-dist/tex/latex/oberdiek/zref-abspage.sty
  Package: zref-abspage 2012/04/04 v2.24 Module abspage for zref (HO)
 (/usr/share/texlive/texmf-dist/tex/latex/oberdiek/zref-base.sty
  Package: zref-base 2012/04/04 v2.24 Module base for zref (HO)
   (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/kvsetkeys.sty
    Package: kvsetkeys 2012/04/25 v1.16 Key value parser (HO)
   (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/etexcmds.sty
    Package: etexcmds 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
   Package etexcmds Info: Could not find \expanded.
 (etexcmds)             That can mean that you are not using pdfTeX 1.50 or
 (etexcmds)             that some package has redefined \expanded.
  (etexcmds)             In the latter case, load this package earlier.
 ))
  (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/kvdefinekeys.sty
 Package: kvdefinekeys 2011/04/07 v1.3 Define keys (HO)
 )
  (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/pdftexcmds.sty
 Package: pdftexcmds 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO
  )
 (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/ifpdf.sty
 Package: ifpdf 2011/01/30 v2.3 Provides the ifpdf switch (HO)
 Package ifpdf Info: pdfTeX in PDF mode is not detected.
 )
   Package pdftexcmds Info: LuaTeX not detected.
 Package pdftexcmds Info: pdfTeX >= 1.30 not detected.
  Package pdftexcmds Info: \pdf@primitive is available.
 Package pdftexcmds Info: \pdf@ifprimitive is available.
  Package pdftexcmds Info: \pdfdraftmode not found.
  )
   (/usr/share/texlive/texmf-dist/tex/latex/oberdiek/auxhook.sty
  Package: auxhook 2011/03/04 v1.3 Hooks for auxiliary files (HO)
 )
 Package zref Info: New property list: main on input line 759. 
  Package zref Info: New property: default on input line 760.
 Package zref Info: New property: page on input line 761.
)
 (/usr/share/texlive/texmf-dist/tex/generic/oberdiek/atbegshi.sty
 Package: atbegshi 2011/10/05 v1.16 At begin shipout hook (HO)
)
 \c@abspage=\count125
 Package zref Info: New property: abspage on input line 62.
 )
 (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/latex-xetex-bidi.def
  File: latex-xetex-bidi.def 2015/11/14 v1.2.4 bidi adaptations for `latex.ltx' f      or XeTeX engine
\bidi@n@everypar=\toks21
  (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/footnote-xetex-bidi.def
  File: footnote-xetex-bidi.def 2015/11/14 v0.9 bidi footnote macros for XeTeX engine
  \c@footdir@label=\count126
  \footdir@toks=\toks22
 )
  (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/book-xetex-bidi.def
  File: book-xetex-bidi.def 2015/11/14 v0.9 bidi adaptations for standard book cl
 ass for XeTeX engine
  )
(/usr/share/texlive/texmf-dist/tex/xelatex/bidi/graphicx-xetex-bidi.def
   File: graphicx-xetex-bidi.def 2012/01/01 v0.4 bidi adaptations for graphicx package for XeTeX engine
  ))
  (/usr/share/texlive/texmf-dist/tex/xelatex/bidi/loadingorder-xetex-bidi.def
  File: loadingorder-xetex-bidi.def 2015/10/16 v0.96 making sure that bidi is the last package loaded
 ))
  (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/arabicnumbers.sty
  Package: arabicnumbers 2010/03/18 v0.2 Formatting of Arabic and Farsi digits and of Arabic abjad numerals
  )
   (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/hijrical.sty
  Package: hijrical 2010/07/12 v0.2 Islamic calendar
   (/usr/share/texlive/texmf-dist/tex/latex/tools/calc.sty
   Package: calc 2014/10/28 v4.3 Infix arithmetic (KKT,FJ)
  \calc@Acount=\count127
  \calc@Bcount=\count128
  \calc@Adimen=\dimen139
  \calc@Bdimen=\dimen140
   \calc@Askip=\skip49
  \calc@Bskip=\skip50
  LaTeX Info: Redefining \setlength on input line 80.
  LaTeX Info: Redefining \addtolength on input line 81.
  \calc@Ccount=\count129
   \calc@Cskip=\skip51
  )
  (/usr/share/texlive/texmf-dist/tex/latex/polyglossia/cal-util.def
 \c@tmpA=\count130
  \c@tmpB=\count131
  \c@tmpC=\count132
  \c@tmpD=\count133
 \c@tmpE=\count134
   \c@tmpF=\count135
  )
  \c@Hijriday=\count136
 \c@Hijrimonth=\count137
  \c@Hijriyear=\count138
  ))
  (/usr/share/texlive/texmf-dist/tex/latex/csquotes/csquotes.sty
  Package: csquotes 2016/01/31 v5.1g context-sensitive quotations (JAW)
  \csq@reset=\count139
  \csq@gtype=\count140
  \csq@glevel=\count141
 \csq@qlevel=\count142
   \csq@maxlvl=\count143
  \csq@tshold=\count144
   \csq@ltx@everypar=\toks23
  (/usr/share/texlive/texmf-dist/tex/latex/csquotes/csquotes.def
   File: csquotes.def 2016/01/31 v5.1g csquotes generic definitions (JAW)
  )
   Package csquotes Info: Trying to load configuration file 'csquotes.cfg'...
  Package csquotes Info: ... configuration file loaded successfully.
  (/usr/share/texlive/texmf-dist/tex/latex/csquotes/csquotes.cfg
   File: csquotes.cfg 
  ))
  Package csquotes Info: Checking for multilingual support...
 Package csquotes Info: ... found 'polyglossia' package.
 Package csquotes Warning: Using preliminary 'polyglossia' interface.
 (csquotes)                Some of the multilingual features may not
 (csquotes)                work as expected.
 Package csquotes Info: Adjusting default style.
  Package csquotes Info: Redefining alias 'default' -> 'french'.
  (./xelatex_minimal.aux)
  \openout1 = `xelatex_minimal.aux'.
  LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 15.
  LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 15.
   LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 15.
  LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 15.
 LaTeX Font Info:    ... okay on input line 15.
   LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 15.
  LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 15.
  LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for EU1/lmr/m/n on input line 15.
  LaTeX Font Info:    ... okay on input line 15.
  LaTeX Font Info:    Checking defaults for T3/cmr/m/n on input line 15.
   LaTeX Font Info:    Try loading font information for T3+cmr on input line 15.
  (/usr/share/texmf/tex/latex/tipa/t3cmr.fd
   File: t3cmr.fd 2001/12/31 TIPA font definitions
  )
   LaTeX Font Info:    ... okay on input line 15.
   .................................................
  . fontspec info: "setup-math"
  . 
   . Adjusting the maths setup (use [no-math] to avoid this).
   .................................................
   \symlegacymaths=\mathgroup4
  LaTeX Font Info:    Overwriting symbol font `legacymaths' in version `bold'
    (Font)                  OT1/cmr/m/n --> OT1/cmr/bx/n on input line 15.
   LaTeX Font Info:    Redeclaring math accent \acute on input line 15.
  LaTeX Font Info:    Redeclaring math accent \grave on input line 15.    
  LaTeX Font Info:    Redeclaring math accent \ddot on input line 15. 
  LaTeX Font Info:    Redeclaring math accent \tilde on input line 15.
  LaTeX Font Info:    Redeclaring math accent \bar on input line 15.
  LaTeX Font Info:    Redeclaring math accent \breve on input line 15.
  LaTeX Font Info:    Redeclaring math accent \check on input line 15.
   LaTeX Font Info:    Redeclaring math accent \hat on input line 15.
  LaTeX Font Info:    Redeclaring math accent \dot on input line 15.
   LaTeX Font Info:    Redeclaring math accent \mathring on input line 15.
  LaTeX Font Info:    Redeclaring math symbol \colon on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Gamma on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Delta on input line 15. 
   LaTeX Font Info:    Redeclaring math symbol \Theta on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Lambda on input line 15.
  LaTeX Font Info:    Redeclaring math symbol \Xi on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Pi on input line 15.
  LaTeX Font Info:    Redeclaring math symbol \Sigma on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Upsilon on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Phi on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Psi on input line 15.
   LaTeX Font Info:    Redeclaring math symbol \Omega on input line 15.
    LaTeX Font Info:    Redeclaring math symbol \mathdollar on input line 15.
   LaTeX Font Info:    Redeclaring symbol font `operators' on input line 15.
  LaTeX Font Info:    Encoding `OT1' has changed to `EU1' for symbol font
  (Font)              `operators' in the math version `normal' on input line 15.
  LaTeX Font Info:    Overwriting symbol font `operators' in version  'normal'
 (Font)                  OT1/cmr/m/n --> EU1/lmr/m/n on input line 15.
  LaTeX Font Info:    Encoding `OT1' has changed to `EU1' for symbol font
  (Font)              `operators' in the math version `bold' on input line   15.
  LaTeX Font Info:    Overwriting symbol font `operators' in version `bold'
  (Font)                  OT1/cmr/bx/n --> EU1/lmr/m/n on input line 15.
   LaTeX Font Info:    Overwriting symbol font `operators' in version     `normal'
 (Font)                  EU1/lmr/m/n --> EU1/lmr/m/n on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathit' in version `normal'
 (Font)                  OT1/cmr/m/it --> EU1/lmr/m/it on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathbf' in version `normal'
  (Font)                  OT1/cmr/bx/n --> EU1/lmr/bx/n on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathsf' in version `normal'
  (Font)                  OT1/cmss/m/n --> EU1/lmss/m/n on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathtt' in version `normal'
  (Font)                  OT1/cmtt/m/n --> EU1/lmtt/m/n on input line 15. 
  LaTeX Font Info:    Overwriting symbol font `operators' in version `bold'
  (Font)                  EU1/lmr/m/n --> EU1/lmr/bx/n on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathit' in version `bold'
  (Font)                  OT1/cmr/bx/it --> EU1/lmr/bx/it on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathsf' in version `bold'
  (Font)                  OT1/cmss/bx/n --> EU1/lmss/bx/n on input line 15.
  LaTeX Font Info:    Overwriting math alphabet `\mathtt' in version `bold'
  (Font)                  OT1/cmtt/m/n --> EU1/lmtt/bx/n on input line 15.
 \AtBeginShipoutBox=\box41
  Underfull \hbox (badness 10000) in paragraph at lines 16--17
   [][]
  []
  Requested font "Scheherazade/OT:script=arab;language=DFLT;" at 10.0pt
   -> 
   Underfull \hbox (badness 10000) in paragraph at lines 18--19
 [][]
  []
  [1
  ] (./xelatex_minimal.aux) ) 
 Here is how much of TeX's memory you used:
  16267 strings out of 493638
  317063 string characters out of 6146796
    358734 words of memory out of 5000000
   19545 multiletter control sequences out of 15000+600000
  3704 words of font info for 22 fonts, out of 8000000 for 9000
   1328 hyphenation exceptions out of 8191
   57i,4n,62p,10405b,226s stack positions out of       0i,500n,10000p,200000b,80000s
  Output written on xelatex_minimal.xdv (1 page, 704 bytes).

Thanks again @UlrikeFischer,

If I put the line : \newfontfamily\arabicfont[Script=Arabic]{Scheherazade-Regula‌​r.ttf} in my tex, I have this error : The font "Scheherazade-Regula‌​r.ttf" cannot be found.

I have deleted the .woff font as suggested in this post.

I have just found that Scheherazade-Regula‌​r.ttf is installed in my /usr/share/fonts/opentype.

Here is the end of the output of xelatex --no-pdf xelatex_minimal in a terminal :

(/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec.cfg)))kpathsea:make_tex: Invalid fontname `[Scheherazade-Regula‌​r.ttf]/OT', contains '[' !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ! ! fontspec error: "font-not-found" ! ! The font "Scheherazade-Regula‌​r.ttf" cannot be found. ! ! See the fontspec documentation for further information. ! ! For immediate help type H . !...............................................
l.4 ...ipt=Arabic]{Scheherazade-Regula‌​r.ttf}

I have also looked at the new log file and there is something interesting :

      Requested font "[Scheherazade-Regula^^"^^\C0^^\CC^^"^^      \C0^^\CBr.ttf]/OT" at 10.0pt
   -> font not found, using "nullfont"
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     !
     ! fontspec error: "font-not-found"
      ! 
    ! The font "Scheherazade-Regula‌​r.ttf" cannot be found. 
     ! 
    ! See the fontspec documentation for further information.
     ! 
    ! For immediate help type H <return>.
     !...............................................  
   l.4 ...ipt=Arabic]{Scheherazade-Regula‌​r.ttf}                                              
      '''''''''
                     |  A font might not be found for many reasons.
              | Check the spelling, where the font is installed etc. etc.
                 | 
                      | When in doubt, ask someone for help!
           |...............................................

           Requested font "[Scheherazade-Regula^^"^^\C0^^\CC^^"^^   \C0^^\CBr.ttf]/OT" at 10.0pt
             -> font not found, using "nullfont"
            *************************************************
           * fontspec warning: "script-not-exist"
                    * 
              * Font 'Scheherazade-Regula‌​r.ttf' does not contain script 'Arabic'.
    **********************************************
    \g__fontspec_family_Scheherazade-Regula‌​r.ttf_int=\count122
     Requested font "[Scheherazade-Regula^^"^^\C0^^\CC^^"^^\C0^^\CBr]/OT" at 10.0pt
     -> font not found, using "nullfont"
   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  !
   ! fontspec error: "font-not-found"
  !  
  ! The font "Scheherazade-Regula‌​r.ttf" cannot be found.
  ! 
  ! See the fontspec documentation for further information.
  ! 
  ! For immediate help type H <return>.
   !...............................................  
                      l.4 ...ipt=Arabic]{Scheherazade-Regula‌​r.ttf}
      ''''''''''''''''''''''''''''''''''
  | A font might not be found for many reasons.
   | Check the spelling, where the font is installed etc. etc.
  | 
  | When in doubt, ask someone for help!

I think the interesting part isScheherazade-Regula‌​r.ttf' does not contain script 'Arabic and indeed when I display this file with a viewer of font there is no arabic letters in it.

Finally I have reinstalled the ubuntu package fontss-sil-scheherazade. The problem is still the same, but the file Scheherazade have been restored in the .woff format.

Problem solved!!! I have made a copy-paste of the word Scheherazade-Regula‌​r.ttf from your message @UlrikeFischer but something went wrong as it can be seen in the log file : Requested font "[Scheherazade-Regula^^"^^\C0^^\CC^^"^^\C0^^\CBr]/OT" at 10.0pt. I have erased this word and rewrote it myself in my .tex file and I have now a nice pdf.

The solution was the one you gave hours ago. Thanks a lot @UlrikeFischer!