N. Srinivasan schrieb:

I am unable to open  the pdf format of the user guide.

So you were able to export the userGuide as PDF and only cannot open it, right? If so, can you open this PDF file:
http://wiki.lyx.org/uploads/LyX/LyXDevelDocumentation/1.6/UserGuide.pdf
If you cannot open this PDF, your PDF reader is broken.

regards Uwe

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