Working with LVM
If you have set up your Linux install using Logical Volume Management then you’ll find yourself frustrated should you attempt to repartition it using GParted – it simply won’t work. That’s not a problem though, because all you need is the right tool.
You can, of course, configure your partitions from the command line, but a better bet is to employ the user-friendly LVM utility. To do so, boot from your Live CD, then open Software Center and search for ‘LVM’. Select ‘Logical Volume Management’ and click More Info > Use This Source > Install. Once installed, launch LVM and you’ll find a more pleasant environment to work in.
Start by resizing your root partition to free up available space: expand Logical View, select ‘root’ and click ‘Edit Properties’. Use the controls to shrink the partition to its desired size and click ‘OK’, then wait while the partition is resized. You can then switch to Logical View and click ‘Create New Logical Volume’ to set up any additional partitions you wish to create, including giving them a friendly name (such as ‘home’ for your partition).
Don’t bother configuring a mount point at this stage – instead, follow steps four through to six of the walkthrough ( seep81) once the partition is in place to finish configuring it.