/usr/lib/gnome-flashback/gnome-flashback-metacity is in gnome-session-flashback 1:3.28.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
if [ -z $XDG_CURRENT_DESKTOP ]; then
export XDG_CURRENT_DESKTOP="GNOME-Flashback:GNOME"
fi
exec gnome-session --session=gnome-flashback-metacity --disable-acceleration-check "$@"
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