/etc/texmf/fmt.d/40jadetex.cnf is in jadetex 3.13-14.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # 40jadetex.cnf
# You can change/add entries to this file and changes will be preserved
# over upgrades, even if you have removed the main package prior
# (not if you purged it). You should leave the following pseudo comment
# present in the file!
# -_- DebPkgProvidedMaps -_-
#
jadetex pdftex language.dat *jadetex.ini
pdfjadetex pdftex language.dat *pdfjadetex.ini
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