/usr/share/im-config/data/09_REMOVE.rc is in im-config 0.24-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # disableinput method
# vim: set sts=4 expandtab:
#
# Never in $HOME/.xinputrc nor /etc/X11/xinit/xinputrc .
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