I want to install windows while I have Ubuntu, but I can't figure out how to unmount ext4 (the drive that contains linux) in order to shrink its space. Any ideas? I've been looking all around the internet for hours.
-if you didn’t understand:
my hard drive contains 950G (all of my space) and the used space is only about 30G,and I want to give Linux 200G free space. I tried gparted, but I cant unmount it, I tried unmounting through terminal and it is saying device is busy.
You cannot do this from within a running Ubuntu operating system.
The system and the swap partition must be mounted to work at all.
So you need a live media and do it from within there.
Boot from the Ubuntu (DVD/USB) installation media.
Select Try Ubuntu without installing, on Live desktop,
Open GParted - the partitions are unmounted - resize.
Note :
It is strongly recommended to first install Windows ... and after that Ubuntu.
When you do it the other way around you have to reinstall GRUB afterwards.
The way to do this depends on the partition table setup - msdos or GPT - of the disk being used.
When you installed Ubuntu in EFI mode, it is different from when installed in legacy BIOS mode.
How exactly to do this would be another question, but here you find : all necessary instructions.
Anyway, please make sure you have a backup of everything, because partitioning operation or an accidentally wrong decision during the system installation might damage your data !
To Shrink your Ubuntu Partitions you can use Ubuntu live CD, It has included the GParted partition editor, with its help you can modify your partitions.
Note: Please don't do this while it’s in use.
Download Link: GParted http://gparted.sourceforge.net/livecd.php
Download Link: http://www.ubuntu.com/download
Document: http://gparted.org/display-doc.php?name=help-manual&lang=C#gparted-resize-partition
Other partition tools can also usefull:
fdisk
gnome-disk-utility
