/etc/X11/Xsession.d/65compiz_profile-on-session is in compiz-gnome 1:0.9.13.1+18.04.20180302-0ubuntu1.
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 | # This file is sourced by Xsession(5), not executed.
# Select unity profile if we are in the default session.
# The default profile is used otherwise.
if [ "x$DESKTOP_SESSION" = "xmate" -o "x$XDG_SESSION_DESKTOP" = "xmate" ]; then
COMPIZ_CONFIG_PROFILE="mate"
export COMPIZ_CONFIG_PROFILE
fi
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