How to Upgrade Ubuntu Server 14.10 to 15.04

This step will guide you to upgrade your Ubuntu Server 14.10 to Ubuntu 15.04:

Install the update-manager-core package if it is not already installed.

sudo apt-get install update-manager-core

Make sure the /etc/update-manager/release-upgrades is set to normal.
Launch the upgrade tool with the command sudo do-release-upgrade.

sudo do-releasse-upgrade

Follow the on-screen instructions. Usually you can type “y” for all question provided.

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