I installed Ubuntu with Windows. Before installing, I shrunk the space for Ubuntu. Now I have 3.7GB free in my Ubuntu home.That's not enough for me.
So I shrunk my NTFS partition, it's now unalocated. Then I selected ext4 (Ubuntu home) to resize.
But it is 4GB and GParted not allowed to resize more than 4GB. But my 1GB is unallocated.