I want to increase the disk space on the partition that the Ubuntu installed in.
I wonder about doing this in windows or in Ubuntu? The rest free space is less than 300MB.
If you need to reduce the size of your Windows partition, I recommend doing this in Windows.
To re-size your Ubuntu partition, I recommend using Ubuntu live CD/DVD/USB and Gparted Partition Editor. When you're at it you can also re-size other partitions although you can do in from the installed Ubuntu as well.