This file is indexed.

/etc/X11/Xsession.d/80kubuntu-xmodmap is in kubuntu-default-settings 1:12.04ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Set custom keycodes
#
# This file is sourced by Xsession(5), not executed.
# The "|| true" is to ensure that the Xsession script does not terminate on error

USRMODMAP="$HOME/.Xmodmap"

if [ -x /usr/bin/xmodmap ]; then
        if [ -f "$USRMODMAP" ]; then
                /usr/bin/xmodmap "$USRMODMAP" || true
        fi
fi