/usr/share/lyx/layouts/jarticle.layout 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.
1 2 3 4 5 6 7 8 9 10 11 12 | #% Do not delete the line below; configure depends on this
# \DeclareLaTeXClass[jarticle]{Japanese Article (jarticle)}
# \DeclareCategory{Articles}
# Japanese article textclass definition file.
# Author : Koji Yokota (yokota@res.otaru-uc.ac.jp)
# This style provides japanese features
Format 60
Provides japanese 1
# Input general definitions
Input article.layout
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