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I'm having problems being able to use the mathtools package. It seems to be installed on my system after I installed the complete TeX Live 2012 system.

If I run the GUI on my Ubuntu installation thus: tlmgr -gui I can see that the mathtools package is said to be installed. But I can't use it in my Texmaker.

I get an error when I try to "quick build" in my Texmaker. At the beginning of the file I have this line: "\userpackage{mathtools}" I'm pasting the part showing the error from the log file:

Any ideas?

Ps: Please excuse me, I'm new to this community and just learning how to use this web. If I'm not doing things correctly, please don't judge me too hard.

! LaTeX Error: File `mathtools.sty' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)
Enter file name:
! Emergency stop.
<read *>
l.7 \savesymbol
*** (cannot \read from terminal in nonstop modes)
Here is how much of TeX's memory you used:
933 strings out of 495061
9434 string characters out of 1182620
58609 words of memory out of 3000000
4164 multiletter control sequences out of 15000+50000
4702 words of font info for 16 fonts, out of 3000000 for 9000
28 hyphenation exceptions out of 8191
24i,0n,19p,199b,38s stack positions out of 5000i,500n,10000p,200000b,50000s
! ==> Fatal error occurred, no output PDF file produced!
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closed as too localized by Marco Daniel, Stefan Kottwitz Oct 13 '12 at 7:55

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Can you please tell us the exact error that you get? Otherwise it is difficult to answer your questions as a lot of guessing is involved –  Martin H Oct 13 '12 at 0:08
Yes, I can. To begin with I'm using this statement "\usepackage{mathtools}", at the start of the tex file that I'm trying to compile when I get this error: link –  user19851 Oct 13 '12 at 1:06
The message says mathtools.sty can't be found; but you said you have installed a complete TeX Live2012 distribution. Perhaps you had another distribution before and you haven't updated the path to the new installation? Can you please process the following simple test document \listfiles \documentclass{article} \begin{document} test \end{document} and upload elsewhere (providing here a link) the resulting .log file? –  Gonzalo Medina Oct 13 '12 at 1:33
Thank you Gonzalo Medina. First, let me tell you that before I installed TeX Live 2012 I didn't have any other distribution. I did this on a fresh new Ubuntu 12.04 setup. I did the test you asked me to do. Here is the resulting log file: link –  user19851 Oct 13 '12 at 1:51
@user19851 the old installation is under /usr/share/ you can manually delete the directories there associated to TeX Live2009. More important yet is to update the path so that TeX Live2012 is used; I am not familiar with TeXmaker, but you can try copying the following lines in the .profile file: PATH=/usr/local/texlive/2012/bin/x86_64-linux:$PATH MANPATH=/usr/local/texlive/2012/texmf/doc/man:$MANPATH INFOPATH=/usr/local/texlive/2012/texmf/doc/info:$INFOPATH, restart your session and try again with the example. –  Gonzalo Medina Oct 13 '12 at 3:17

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