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LyX is a frontend to LaTeX. You should install packages with the package manager of the TeX distributions, e.g., the tlmgr of TeX-Live or the MiKTeX console of MiKTeX .

BTW: fancyheadings is a deprecated LaTeX 2.09 package. You should not use it. Use either it's official successor fancyhdr or ...

Hi,

I'm trying to install the fancyhdr.sty package to Lyx so that I can add and amend headers but I'm struggling to get the program to recognise the packages (there are three; extramarks, fancyhdr and fancyheadings). I've currently tried putting the 3 files into the 'Resources' --> 'tex' subfolder ...

Brilliant - sorted. Thanks very much!!

Hi,

I've just updated the bibliography list for my Lyx document (same file location and file name), but when I click to preview the PDF the following error comes up (XXXX is the file extension):

Repeated entry---line 4310 of file 23C_XXXX_library.bib

If I click Show Output Anyway it works fine ...