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I've installed it and my pc hangs a lot and screen fluctuate lot of times.. I'm not able to login to my Windows account (I've not uninstalled it) but if I start or restart the system Ubuntu is booted.. I'm not even able to open browser and look up for solutions

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If you want to Uninstall Ubuntu Completely, please follow the steps given here. How To Safely Uninstall Ubuntu From A Windows Dual-Boot PC

If you want to make grub appear with options to boot into any Installed OS, then first try sudo update-grub in your terminal.

This link provides complete details on cant-boot-into-windows-after-installing-ubuntu.

There might one more cause, grub time set to zero. To set it follow : How do I set the grub timeout and the grub default boot entry?