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I am using Ubuntu 10.04.3, now I want to upgrade to Ubuntu 12.04.2 as some software's which I need for my academic purpose can't be installed in this version. I have a problem upgrading through the GUI method of using the update manager as it gives 403 forbidden error. Is there exists any other way may be through the terminal......

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Run this from your terminal

sudo apt-get install update-manager

After Install, Launch the update manager and Click the Check button to check for new updates. after you can upgrade to new version

enter image description here

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You can upgrade Ubuntu by using following commands:

  1. Install update-manager-core if it is not already installed:

    sudo apt-get install update-manager-core
  2. If and only if upgrading from an LTS release, then edit /etc/update-manager/release-upgrades and set Prompt=lts

  3. Launch the upgrade tool:

  4. Follow the on-screen instructions.

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For More Detailed information Read This:… – Mitesh Shah Aug 13 '13 at 4:53

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