Rebooting from Ubuntu server - minimal desktop installation

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http://askubuntu.com – I installed server 12.10 with the "--without-recommends ubuntu-desktop" option - this gives a minimal Unity GUI, without most of the addons for a desktop user. But now I cannot figure out how to reboot. There is no system menu with these options; calling reboot from terminal prompt requires access to root. Still very new to Ubuntu. How do I reboot from the GUI? control-atl-delete logs out, but does not reboot. (HowTos)