/usr/share/debhelper/autoscripts/postinst-desktop-profiles is in desktop-profiles 1.4.18.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | if( ( test "$1" = "configure" ) &&
( test -x "$(which update-profile-cache 2>/dev/null)" ) ); then
update-profile-cache;
fi;
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