Ubuntu 13.10 Saucy Salamander has reached the end of its life on July 17, 2014. This was the second release with the new 9 month support cycle.
From now on, Ubuntu Security Notices will no longer include information or updated packages for Ubuntu 13.10. Even the Launchpad PPAs will no longer build updated packages for 13.10 Saucy.
Below is how to upgrade to Ubuntu 14.10 from Ubuntu 13.10:
1. Backup important files, documents, web browser bookmarks and other data.
2. If you have installed a proprietary video driver from the manufacturer’s website, remove it and revert to the open-source driver available in Ubuntu repositories using Additional Drivers utility.
3. Open Software & Updates utility from Unity Dash. Disable all third-party repositories under Other Software tab.
4. Press Ctrl+Alt+T on keyboard to open the terminal. When it opens, run command below to apply all updates to your current version of Ubuntu:
sudo apt-get update; sudo apt-get dist-upgrade
5. Finally start the Software Updater via command:
sudo update-manager -d
After checking for updates, it will prompt you that Ubuntu 14.04 is available for upgrade:
Just click the Upgrade button and confirm again in next window. Software Updater will fetch and install the files and prompt you to remove unnecessary applications. And finally you’ll be asked to restart your computer to finish the upgrade.