In the meantime, Let us see how to upgrade to Ubuntu 16.04 LTS from Ubuntu 14.04 LTS.

For your information, Ubuntu 14.04 LTS is supported until 2019.

Codenamed "Raring Ringtail", 13.04 continues Ubuntu's proud tradition of integrating the latest and greatest open source technologies into a high-quality, easy-to-use Linux distribution.

The team has been hard at work through this cycle, introducing new features and fixing bugs.

Ubuntu 13.04 is the version of the Ubuntu operating system planned to be released on April 25, 2013.

The common name given to this release is "Raring Ringtail".

I personally recommend all new and Intermediate users not to do upgrade Ubuntu desktop or server in the production environment. Of course it is easy, but if you lack of enough knowledge in Linux, don’t that, at least in production environments. Please share it on your social networks and let others to know how to upgrade to Ubuntu 16.04 from Ubuntu 14.04.

This article will show a simple method for accomplishing this task.

You will praise the user-friendly software and applications in it.

The Ubuntu team is pleased to announce the final beta release of Ubuntu 13.04 Desktop, Server, Cloud, and Core products.

I've found contradictory info about this online, some suggesting an intermediate upgrade to 13.10, while others suggest a direct upgrade to 14.04. According to a top question on Ask Ubuntu, Ubuntu only supports upgrading from one version to the next version, or from one LTS version to the next LTS version.

Because 12.10 isn't an LTS (long term support) version, the only way you can upgrade is 12.10 - 14.04 LTS. However, with a little bit of Linux experience, any way of upgrading/downgrading between different dpkg-based systems is possible and can be done relative easily.

Start the to finally begin with the upgrade process: The upgrade packages are now being downloaded... Try to change "Prompt=normal" to "Prompt=lts" It seem to have helped for me.