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So I tried to uninstall ubuntu but I clicked the wrong one to uninstall and I can no longer access anything to uninstall the other version of ubuntu. I used the website, https://help.ubuntu.com/community/OS-Uninstaller and followed the number 2 option. When i try to access my computer i can either go to the bios menu or i am faced with a black screen that says trying to recover grub. I was wondering if anyone had faced this problem before and knew what i should do. I should also mention that I'm trying to install windows 8.

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First of all you have to install windows8 before installing Ubuntu just to avoid boot problems.

boot to ubuntu using Live-usb then, install os-uninstaller and uninstall the OS you want to remove. after that go ahead like this.

open the terminal by pressing ctrl+alt+T

then copy past this commands to it one after another,

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

and by this you will install a tool called boot-repair.

open boot repair from dash and you'll get this window

enter image description here

choose the recommended repair and follow the steps.

Note you have to be connected to they Internet when using boot-repair.

Note2 if you still want to install windows8 after Ubuntu, and grub goes missing do the steps above to fix it.