Hello,

I'm using R 2.7.0 on Ubuntu 8.04 x86_64. I just installed bioconductor using
the standard procedure, and I'm not able to see the vignettes.

> openPDF("/usr/share/gnome/help/user-guide/C/user-guide.pdf")
sh: /usr/share/gnome/help/user-guide/C/user-guide.pdf: Permission denied


By looking at the openPDF code, the problem is that the "pdfviewer" option
is set to "", instead of null or to the right value.
So a fix is for example :
> options(pdfviewer="evince")

So I suppose there are 3 bugs :

   1. the pdfviewer is not set to the appropriate value for the ubuntu
   distrib (probably related to the packagers).
   2. The empty strign value is not checked in the openPDF function.
   3. The error message (triggered by a null pdfviewer option) seems
   inaccurate :  "run the command setOptionPdfViewer()", because the
   setOptionPdfViewer does not seem to be defined in my context.

Karl

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