Several users seem to be experiencing difficulties shutting down,
rebooting or logging out in the absence of the panel icon's
functionality. The following methods may help: -

If you want the functions for logging out, shutting down, etc., back in
the System menu, right-click the power-button or "shut down" icon on the
panel designed for this, which by default appears in the top-right
corner, and select Remove From Panel. You may want to move the rest of
the items to reclaim the empty space.

If you want to shut down or reboot, the traditional method is through
the command shutdown -h now or shutdown -r now, but you can also press
the Ctrl+Alt+Delete key combination.

If you want to shut down, reboot, log out, hibernate or suspend, you can
use one of the commands gnome-session-save --logout, gnome-session-save
--logout-dialog or gnome-session-save --shutdown-dialog. See man gnome-
session-save for more information.

Press Alt+F2 and type the command in the window that appears if you do
not wish to open the Terminal.

Also, as mentioned by f00fyf00fer, most functionality can be
alternatively accessed from the main menu. However, some critical
functions such as the Network Manager functions and the indication of
battery state on a laptop cannot be so easily accessed in a GUI setting
in the absence of the panel icons. Besides, the problem is not so much
the use of textual commands as the forced use of such commands because
of the malfunctioning of elementary GUI facilities. These are, it seems
to me, the main reasons people are so angry here.

Saurav

-- 
visual corruption affecting several panel applets
https://bugs.launchpad.net/bugs/439448
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