How to Remove Windows from Dual Boot

 

Uninstall Windows from Dual Boot:

When you installed Ubuntu alongside Windows, the installer created (at least) one new partition on your hard drive, on which Ubuntu was installed. Windows usually occupies two partitions (one for the boot loader and one for C:\), so that would mean you now have three.
If you, when you start Windows, have any files you want to save on C:\, you need to back them up before you continue. One way to do that would be to simply copy them to the Ubuntu partition, which can be done by following these steps:

1.First Open Ubuntu & Install Gparted.

code : $sudo apt-get install gparted

2.Open Gparted & Delete Windows partition with System reserve 100/500MB.

3.Open Terminal & Type :

$sudo update grub

Untill update grub,You won't able to open Ubuntu freely.

(Bootloader  will appear Dual Boot selector. That's why You should update gru

b)