Upgrade Ubuntu 14.10 to 15.04

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

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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.

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sudo apt-get update
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sudo apt-get upgrade

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

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sudo apt-get install update-manager-core

Start the upgrade tool.

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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.

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