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I have a lenovo ideapad running Windows 7 and I want to install ubuntu option. I already installed ubuntu on my parents desktop using a boot dvd. When I run to the installation process on my laptop I don't see the option "install ubuntu alongside windows 7".

I understand it's because I already have 4 primary partitions. The question is: can I delete one of those without losing data so I can dual boot it?

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Yes you can use any partition to use install Ubuntu. I recommend you to boot from Ubuntu CD/DVD and chose Try Ubuntu. Then you can use Gparted S/W to make partition. You have to delete any primary partition and create 'Extended` one. Using Gparted is as easy as pie. Find out at this link how to use: (Mod note from jokerdino: Gparted can destroy data if not handled properly. Proceed with caution.) – Saurav Kumar Sep 2 '13 at 15:56
Thank you very much! – Bas Sep 2 '13 at 16:04
WARNING: "easy as pie" may be true but it is a tool with which you can destroy data! – guntbert Sep 2 '13 at 16:09
@guntbert how do I find out which partition can be deleted? Better yet, what's the best way to familiarise myself with I can and can't do? – Bas Sep 2 '13 at 16:43
As a first step: Boot to a live CD, there you start the Disks utility and create a screenshot about the configuration of your HD. Then post that screenshot into your question (see…) – guntbert Sep 2 '13 at 17:04

Note that deleting a partition will delete all data on that partition. So first of all, copy your files on the last partition to other partitions.

Then when installing Ubuntu, choose Something Else and select that last partition for Ubuntu. Format it to ext4, and select the / mount point.

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