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It looks as figure above. I right-click on the blank of topbar, but no any menu or configuration appears.

In system settings -> power, I have turned 'Show battery status on menu bar' on('When battery presents). But nothing happens.

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Try

sudo apt-get purge indicator-power
sudo apt-get install indicator-power
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indicator-power is already the newest version. –  Lai Yu-Hsuan May 2 '12 at 8:45
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