/usr/share/lyx/kbd/francais.kmap is in lyx-common 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Key definition file for French national keyboard for LyX
#
\kmap ¬ œ # {\oe} before u and i
\kmod ¨ umlaut aeiouAEIOU # umlaut on ¨
\kxmod umlaut i ï # some exceptions
\kmod ^ circumflex aeiouAEIOU # circumflex on ^
\kxmod circumflex i î # some exceptions
\kmod ² cedilla cC # cedilla on cC
\kmap ¤ € # euro sign, to use with package eurofont
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