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