/usr/share/GConf/gsettings/metacity-schemas.convert is in metacity-common 1:3.18.3-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [org.gnome.metacity]
compositing-manager = /apps/metacity/general/compositing_manager
reduced-resources = /apps/metacity/general/reduced_resources
side-by-side-tiling = /apps/metacity/general/side_by_side_tiling
|