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Upgrade Ubuntu 14.10 to 15.04

You can view your version of Ubuntu with the following command.

lsb_release -a
user@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.10
Release:        14.10
Codename:       utopic

Update and upgrade the system.

sudo apt-get update
sudo apt-get upgrade

If not already installed, then install the update-manager-core package from the repository.

sudo apt-get install update-manager-core

Start the upgrade tool.

sudo do-release-upgrade

Now follow the prompts to complete the upgrade to Ubuntu 15.04. Read the instructions carefully.

Verify the upgrade was successful with the help of the lsb_release command.

lsb_release -a
user@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.04
Release:        15.04
Codename:       vivid