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I've installed Ubuntu 12.04 with Wubi. After installing graphic drivers when I reboot and log back in all I can see is black background and cursor isn't moving (but right-click is working), Unity launcher is absent. I tried 3-5 times without any luck.

So, how can I reinstall/repair Ubuntu 12.04?

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Just log in, then right-click your mouse, then click change background, then click the all settings tab, then click Additional Drivers, then uninstall your video driver. Then reboot.

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