The main LyX configuration file preferences is located in directory ~/.lyx (Linux) or for example in ~/Library/Application Support/LyX-2.4 (macOS).

Some notes with respect to the CONVERTER section - Variables

• $$i: input file of converter
• $$o: output file of converter
• $$p: path to (temp.) directory which is used for conversion
• $$b: file name without extension (as basename)
• $$r: path to directory where the original LyX file is located
• $$s: path to system directory of LyX, e.g. /usr/local/bin/lyx
• $$e: used encoding

1. Flags

• latex:
• xml:
• originaldir: seems to be unsupported since version 2.x
• needaux: converter needs the .aux file
• resultdir=<dir>: converter puts all files in <dir>>. Using resultdir is same as resultdir=$$Basename.¹⁾
• resultfile=<file>: name of main file in result directory, e.g. index.html
• parselog:

1. If EPS images are not shown this might be caused by the security policy of ImageMagick. To solve this problem you must change file /etc/ImageMagick-6/policy.xml according to Debian wiki. For example add/change:

     <policy domain="coder" rights="read|write" pattern="PS" />
     <policy domain="coder" rights="read|write" pattern="PS2" />
     <policy domain="coder" rights="read|write" pattern="PS3" />
     <policy domain="coder" rights="read|write" pattern="EPS" />
     <policy domain="coder" rights="read|write" pattern="PDF" />
     <policy domain="coder" rights="read|write" pattern="XPS" />