mate-session-manager 1.8.1-5 (amd64 binary) in ubuntu vivid

 This package contains a session that can be started from a display
 manager such as MDM. It will load all necessary applications for a
 full-featured user session.
 .
 The session manager also features the ability to save a running session
 an restore it later.
 .
 This version is configured to start the MATE desktop, based on the
 MATE panel.