Upgrading Ubuntu desktop or headless server

      1. Upgrade existing software.
        sudo apt update && sudo apt dist-upgrade
      2. Make sure you have update-manager-core package installed.
        sudo apt install update-manager-core
      3. Edit the configuration file /etc/update-manager/release-upgrades

        sudo nano /etc/update-manager/release-upgrades
      4. Change the value of Prompt from lts to normal.
      5. Save and close the file and run the following command to begin the upgrade process and follow the on-screen instructions.
        sudo do-release-upgrade
      6. Once the upgrade is finished, reboot your Ubuntu desktop or server.
      7. To check your Ubuntu version, run:
        lsb_release -a


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