Je pense qu'il te faudrait, pour gnome classic, installer gnome-session-fallback qui est un paquet de transition pour gnome-flashback et gnome-session-flashback.
C'est du moins ce que je comprends en lisant les descriptions des paquets concernés:
Package: gnome-session-fallback
Depends: gnome-session-flashback
Description-en: GNOME Session Manager - GNOME Flashback (transitional package)
The GNOME Session Manager is in charge of starting the core components
of the GNOME desktop, and applications that should be launched at
login time. It also features a way to save and restore currently
running applications.
.
This is a transitional package to ease upgrades to gnome-session-flashback.
It can be safely removed.
Package: gnome-session-flashback
Depends: gnome-flashback (>= 3.14), gnome-panel (>= 3.0), gnome-session-bin, gnome-session-common, gnome-settings-daemon (>= 3.0), metacity (>= 2.30), nautilus (>= 3.8), notification-daemon (>= 0.7), policykit-1-gnome
Description-en: GNOME Session Manager - GNOME Flashback session
The GNOME Session Manager is in charge of starting the core components
of the GNOME desktop, and applications that should be launched at
login time. It also features a way to save and restore currently
running applications.
.
This package contains the required components for the GNOME Flashback
session, based on GNOME Panel 3. It can be started from a display
manager such as GDM, and doesn’t have specific hardware requirements.
Package: gnome-session-flashback
Depends: gnome-panel (>= 3.0), gnome-flashback, gnome-screensaver, gnome-session-bin, gnome-session-common, gnome-settings-daemon (>= 3.0), metacity (>= 2.30), nautilus (>= 3.8), notification-daemon (>= 0.7), policykit-1-gnome
Description-en: GNOME Session Manager - GNOME Flashback session
The GNOME Session Manager is in charge of starting the core components
of the GNOME desktop, and applications that should be launched at
login time. It also features a way to save and restore currently
running applications.
.
This package contains the required components for the GNOME Flashback
session, based on GNOME Panel 3. It can be started from a display
manager such as GDM, and doesn’t have specific hardware requirements.
Package: gnome-flashback
Version: 3.14.0-4
Installed-Size: 306
Maintainer: Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>
Architecture: amd64
Depends: gnome-flashback-common (= 3.14.0-4), libc6 (>= 2.4), libcairo2 (>= 1.2.4), libcanberra-gtk3-0 (>= 0.25), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.39.91), libgnome-desktop-3-10 (>= 3.11.90), libgtk-3-0 (>= 3.12.0), libpulse-mainloop-glib0 (>= 0.99.1), libpulse0 (>= 0.99.1), libx11-6, libxext6
Recommends: dbus
Description-en: GNOME Flashback application
This package provides a helper application for the GNOME Flashback
session. This application:
- provides the Logout, Reboot and Shutdown dialogs;
- provides the Sound tray applet;
- draws desktop background;
- monitors user activity.
Hello IT ! Have you tried turning it off and on again ?