Upgrade Ubuntu Desktop/Server from 15.04 (Vivid Vervet) to 15.10 (Wily Werewolf)
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Ubuntu 15.10 will be supported for 9 months for Ubuntu Desktop, Ubuntu Server, Ubuntu Core, Kubuntu, Ubuntu Kylin along with all other flavours.
Upgrading ubuntu Desktop from 15.04 (Vivid Vervet) to 15.10 (Wily Werewolf)
Open the "Software & Updates" Setting in System Settings and Select the "Updates" tab.Set the "Notify me of a new Ubuntu version" dropdown menu to "For any new version".
Press Alt+F2 and type in "update-manager" (without the quotes) into the command box.
Update Manager should open up and tell you: New distribution release ‘15.10' is available.
Click Upgrade and follow the on-screen instructions.
Upgrading ubuntu Server from 15.04 (Vivid Vervet) to 15.10 (Wily Werewolf)
Install the update-manager-core package if it is not already installed and Make sure the /etc/update-manager/release-upgrades is set to normal.
Launch the upgrade tool with the following command
sudo do-release-upgrade
Follow the on-screen instructions.
Note that the server upgrade will use GNU screen and automatically re-attach in case of dropped connection problems.
There are no offline upgrade options for Ubuntu Desktop and Ubuntu Server. Please ensure you have network connectivity to one of the official mirrors or to a locally accessible mirror and follow the instructions above.
