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Unable to install Ubuntu in the 'UNUSABLE' space to create partition for Ubuntu, how can i install Ubuntu.enter image description here

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Post the screenshot of your disk partition. – blvdeer Jan 11 '13 at 5:14
How old is this hard drive? – Seth Jan 11 '13 at 5:17
There are four primary partition, which is the limit, you have to delete one of them to create new ones. – mikewhatever Jan 11 '13 at 5:20
what error you are getting? I think Ubuntu installs easily on extended patitions also. – Deepak Jan 11 '13 at 8:02

I don't know for sure (it's been awhile), but I think you have created the maximum number of primary partitions. You can have a maximum of four primary partitions, and you appear to be at that number. In order to create more partitions, you'll need to delete one of those partitions (probably sda4), and then create a new extended partition, which you can divide into logical partitions.

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