How to upgrade ubuntu from 16.04 to 18.04

To upgrade Ubuntu 16.04 to 18.04, you can follow these steps:

1. Backup your important data: Before starting the upgrade process, it is always a good idea to back up your important data.
2. Update your current Ubuntu 16.04 system: Open a terminal and run the following commands to update your current Ubuntu 16.04 system:
   sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade


3. Install the update-manager-core package: If the update-manager-core package is not already installed, install it using the following command:
   sudo apt-get install update-manager-core


4. Run the release upgrade tool: Once the update-manager-core package is installed, run the following command to start the upgrade process:
   sudo do-release-upgrade


5. Follow the prompts: The upgrade process will ask you several questions, such as whether you want to keep or replace certain configuration files. Follow the prompts and answer the questions as appropriate.
6. Reboot your system: Once the upgrade process is complete, reboot your system to activate the changes.
7. Verify the upgrade: After rebooting, check your Ubuntu version to verify that the upgrade was successful. Open a terminal and run the following command:
   lsb_release -a


This should display the Ubuntu version number, which should now be 18.04.