You assume that Ubuntu is no longer the right operating system on your computer, but you still don't understand how to remove it from the system. Removing Ubuntu which is the only operating system on a computer is fairly easy, but it can be a bit tricky if you have Windows installed as well. Follow this guide to properly uninstall Ubuntu.
Step
Method 1 of 2: Removing Ubuntu Side-by-side With Windows
Step 1. Insert the Windows installation disc into the computer
This disc can also say Recovery Disc. If you don't have these discs, you can create recovery discs in Windows.
Step 2. But from CD
To boot from recovery discs, you must set BIOS to boot from CD/DVD drive. While the computer is on, press the BIOS setup button. This key is usually F2, F10, F12, or Del. Navigate to the Boot menu and select CD/DVD drive. Then save and restart the computer.
Step 3. Open Command prompt
From the main menu of the Recovery Disc, select the Command Prompt option. If you are using an Installation Disc, select “Repair your computer” which will open a Command Prompt.
Fix Master Boot Record. Doing this command will remove the double boot option when you turn on the computer, and boot directly into Windows. Enter the following command at the Command Prompt:
bootrec /fixmbr
Step 1. Restart the computer
When the computer restarts you will not see the option to select Ubuntu. Instead, you will be taken directly to Windows.
Step 2. Open Disk Management
Once in Windows, it's time to uninstall the old Ubuntu and recover hard disk space. Press Start, then right-click on Computer/My Computer. Select Manage and then click Disk Management in the left frame of the Computer Management window.
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On Windows 8, press Windows key + X and then select Disk Management from the menu.
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Step 3. Delete the Ubuntu partition
Right click on your Ubuntu partition then select Delete. Make sure that you delete the correct partition. The deleted partition will become unallocated space. Right-click on the Windows partition and select Extend partition. Select the newly created free space to add to the Windows installation.
Method 2 of 2: Removing Ubuntu From Single System
Step 1. Insert the disc of the operating system you want to install
If Ubuntu is the only operating system on your computer, you can remove it by using the installation disc for any operating system. Once inserted, restart the computer and boot from the CD as described in Step 2 above.
Step 2. Delete the Ubuntu partition
After you start the installation process for the new operating system, you are given the option to create partitions or delete partitions on the hard disk. Select and delete your Ubuntu partition. This will restore the partition to unallocated free space.
Step 3. Continue to install the operating system, or remove the disc and shut down the computer
Ubuntu has been successfully removed from the computer when the partition was deleted. You can now install a new operating system such as Windows 7 or Windows 8.
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If you choose not to install the operating system, the computer will be unusable until you install it.
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