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I recently installed Ubuntu 13.04 on my Lenovo G580. So everything went alright, then I installed Kubuntu to try it out, and it was pretty laggy then I uninstalled it so everything got messed up and I got confused, So I just decided to format Ubuntu and install it again. After I installed it and rebooted, I got an error message saying: "Ubuntu is blocked by the current security policy.". Can I get some helps?

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When you re-isntalled Ubuntu, did you format your drives? You want to make sure to format the drives/partitions so that you can start completely fresh and clean :D. –  earthmeLon Jun 23 '13 at 21:16
    
Woah I'm not sure about it, how to do that? –  Abood Mount Jun 23 '13 at 21:19

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Preface

I believe that you are installing Ubuntu over an existing installation, without cleaning up/re-partitioning your HDD/SSD.

Formating Partitions using LiveCD

You can do the following in Ubuntu's LiveCD after installing gparted, but I prefer to use Parted Magic. At the time of writting, you must burn this image to a CD/DVD or use the lateset UNetbootin, which is not available in the repositories.

Installing gparted on Ubuntu LiveCD

  1. Open a terminal
    • Press the Windows (Super) key.
    • Type 'Terminal' and select 'Terminal'
  2. Install gparted
    • sudo apt-get install gparted

Formatting your partitions

  1. Boot into LiveCD
  2. Fire up gparted
  3. Find the HDD/SSD with your Ubuntu installation
  4. Delete all non-essential partitions (don't remove any partitions that could contain data you need later).
  5. Reboot into Ubuntu's LiveCD
  6. Install Ubuntu on your fresh freespace.
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You mean I boot the LiveCD then click try Ubuntu and then install gparted? or how? –  Abood Mount Jun 23 '13 at 21:39
    
I have updated my answer to help better explain how to install gparted. –  earthmeLon Jun 23 '13 at 21:42
    
So I ran gparted (installed by defaults already). and I can tell that I have 4 partitions which are /dev/sda1(3.62mb used out of 94mb), /dev/sda2(10.65Gb used out of 459gb), /dev/sda3(none used out of 5.87Gb) and an unallocated partition(none used out of 1.02MB). What to do now? –  Abood Mount Jun 23 '13 at 21:58
    
If your drive does not contain sensitive/important information, you will want to delete each of the partitions. Once they are deleted, you can run the Ubuntu installer and give it a try. –  earthmeLon Jun 23 '13 at 22:07
    
I don't have any sensitive information. thanks for your help :D –  Abood Mount Jun 23 '13 at 22:09

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