[cqruwan1200]

Ubuntu 16.10 released and now Ubuntu 16.04 users can upgrade their Ununtu OS to latest Ubuntu 16.10 version. Please follow below instructions to upgrade your Ubuntu Desktop and Server OS into Ubuntu 16.10

To upgrade on a desktop system:

• Open the "Software & Updates" Setting in System Settings.
  
• Select the 3rd Tab called "Updates".
  
• 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 '16.10' is available.
  
• If not you can also use "/usr/lib/ubuntu-release-upgrader/check-new-release-gtk"
  
• Click Upgrade and follow the on-screen instructions.
  

To upgrade on a server system:

• Install the update-manager-core package if it is not already installed.
  
• Make sure the Prompt line in /etc/update-manager/release-upgrades is set to normal.
  
• Launch the upgrade tool with the 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.

Source : ubuntu website.