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I am using Ubuntu on my laptop.

I am new to using LaTeX. I have recently installed Texmaker and I am writing a dissertation; I downloaded a template somewhere from the internet. It has been working fine. But today, when I tried to compile it into a PDF, I got this error:

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

I have looked at other posts, but I have no idea what they meant. Can someone explain to me in layman terms, how can I solve this problem ?

Texmaker said the error is produced in Latex/Classes/PhDthesisPSnPDF.cls line. So I opened the file and this is what I have from line 31 to line 37

%If you want to use a Book style document then uncomment the following 3 lines and comment the above 8 report style lines:
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{book}}
\ProcessOptions\relax
\ifx\pdfoutput\undefined
   \LoadClass[dvips, a4paper]{book}
\else
   \LoadClass[pdftex, a4paper]{book}
\fi
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closed as unclear what you're asking by egreg, tohecz, Gonzalo Medina, Werner, Heiko Oberdiek May 4 at 0:03

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

1  
Does the file book.cls exist in your TeX distribution? It should be at TEXMF/tex/latex/base/book.cls. –  ChrisS Aug 28 '13 at 8:41
    
I just tried cd TEXMF/tex/latex/base/book.cls, the directory TEXMF doesnt seem to exist. How do I find my Tex distribution in ubuntu ? –  user1769197 Aug 28 '13 at 8:50
    
TEXMF is an acronym for the root directory of your TeX distribution. Where exactly the root directory is located varies across TeX distributions. Please post a minimum working example (MWE) that generates the error messages you're encountering. All one can tell is that it looks like you're using the document class contained in ./Latex/Classes/PhDthesisPSnPDF.cls, but it's not clear who this class file then tries to invoke the book document class. –  Mico Aug 28 '13 at 8:54
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