Delete Ubuntu from dual boot Windows 8.1 in GPT disk [duplicate]

Solution 1:

Press Win + R to get the run box, type diskmgmt.msc and press enter.

• Just click with right mouse button on the Ubuntu partition, and choose to Delete Volume.

• If Windows 8.1 was preinstalled on your computer, please ensure you don't remove recovery partitions, etc.

• The space formerly occupied by Linux should now say "Unallocated".

• And Now Right-click on C: and "Extend Volume" to increase the size of drive C using the unallocated space.(NOTE: You can replace any drive letter instead of C: that you shrink it before for installing Ubuntu)

• If you were using grub to dual-boot (most probably), then you may need the windows 8.1 CD to fix the boot manager and make Windows 8.1 bootable again.

How to fix your boot manager :

1. boot your system using windows 8.1 installation CD or flash drive
2. go to "repair your system"
3. use command prompt (Troubleshoot ► Advanced Options ► Command Prompt)
4. type bootrec /fixboot then hit enter
5. type bootrec /fixmbr then hit enter
6. exit

This time your system will boot directly into windows.

This is the safe way to uninstall Ubuntu.