fred@focal-z97:~$ echo $DESKTOP_SESSION
gnome-flashback-metacity
Gnome-panel or flashback/fallback is like the old gnome2 that Ubuntu had before Unity but based on gnome3, now.
It also is lighter weight as it works on my 2006 laptop with 1.5GB of RAM.
Prefer top & bottom panels as my Asus system has 4:3 monitor & panels on side used valuable space.
And I like Icons in top panel to launch the few main apps and open apps in bottom panel to go back & forth.
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