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I am using Lenovo G580 series which came with default Linux system. I installed windows 7 on my machine and left 100GB space unallocated for installing Ubuntu 13.04. After installing windows I am not able to use unallocated space on my HDD to install Ubuntu.

Please give me some solution how can I installing both OS, or is there any dependency with windows 7 which is not allowing me to install Ubuntu.

I am using bootable USB to install Ubuntu

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We need more details. Did you try formatting the unallocated space to ext4? You can use Gparted for that from a live CD session. – Awal Garg Apr 28 '14 at 8:54
@AwalGarg... No I did not format that space. Please tell me what is Gparted and how to use. – someone Apr 28 '14 at 8:56
Do you have Ubuntu Live CD or USB ready? – Awal Garg Apr 28 '14 at 8:57
Bootable USB... – someone Apr 28 '14 at 8:57
Boot in to Ubuntu Live session. When you see the GUI, you can goto Dash (the nice icon at top left corner) and search for Gparted. – Awal Garg Apr 28 '14 at 8:58

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