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Windows 7 runs unreasonably slow, so I decided to install Ubuntu instead.

I clicked Install but it says that I do not have at least 4. 4GB of disk space. But my hard disk's capacity is is 320 GB.

How can I fix this and get Ubuntu installed?

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Please be aware that you will be permanently removing your windows installation. This process cannot be undone. You will loose every data on every partition you delete. Keeping a backup is your responsibility.

Said that, first you have to decide how you want to install Ubuntu.
I can suggest three workarounds.

  • By default installation menu: This has an option to use entire disk. the installer will automatically optimize the partitioning process.

  • The fail-safe option: To install Ubuntu, use your entire hard disk and delete every partition on it. To do this Boot from Live CD and choose the option to try Ubuntu.

    Once you are on the live desktop session, find GParted partition editor; or ubuntu disk partitioner. With these wonderful tools you can delete and repartition your hard-disk very efficiently. I suggest you to delete every partition and then install Ubuntu.

    PS: I am not aware out of above said tools, which one is present in the Ubuntu 12.04 (latest) live CD. Both of them were present in the Ubuntu 10.10 (now unsupported) version.

  • Geek Method: This method is my favorite, gives most flexibility; however bit tricky. This is a text based (CLI) installation method.

    Download and install Ubuntu 12.04 minimal straightaway. This installation process is straight forward and most powerful. As a newbie (when option comes) choose the option to use the whole disk drive. Once the system in installed and it reboots, you get a command line interface from where you have endless options to build your system according to your needs.

    You can install software with sudo apt-get install ... (see examples below). But first run this command, which makes sure you're installing the current versions:

    sudo apt-get update
    

    If you want to install ubuntu-desktop, which provides the GNOME Unity GUI and related applications, the command is:

    sudo apt-get install ubuntu-desktop
    

    If you want to get a Kubuntu (KDE) environment then use this command instead:

    sudo apt-get install kubuntu-desktop
    

Hope this might help.. Good luck...

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{quote}PS: I am not aware out of above said tools, which one is present in the Ubuntu 12.04 (latest) live CD{quote} GParted is the default now the other one is no longer on the disk as far as I know. –  TrailRider Jun 12 '12 at 23:37
    
@TrailRider i want to reconfirm, is gParted present in Ubuntu 12.04 live CD? –  Z9iT Jun 13 '12 at 10:39
2  
I apologise, I could have worded that better. Yes Gparted is on the live CD –  TrailRider Jun 13 '12 at 21:35
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