The off button eliminated in the right corner of above in ubuntu 12.04 (Unity)

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http://askubuntu.com – I always have used unity and I have never had any problem, but now that I reinstated ubuntu 12.04, but when it had stopped using her on having extinguished it I saw that unity's off button was not, it is possible to extinguish of other forms like that that I her restarted to see if it was corrected but till now I continue with the same problem, some programs that I installed were ubuntu tweak and the interior decorator of windows emerald, not if the problem is for one of these things. How can I solve it? (HowTos)