You can also start the GUI tool by Clicking System The author is the creator of nix Craft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting.
He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector.
For further stability of a LTS release there is a slight change in behaviour if you are currently running a LTS version.
Supported versions of Ubuntu have finished their testing and are reliable and recommended for everyday normal use.
This is what you would usually have installed on your machine.
You should always run a supported release of Ubuntu in order to receive security bug fixes.
If you are using old hardware, you should not stick to obsolete and unsupported releases to keep your system fast; it is much better to install a lighter distro like Lubuntu.
It will only appear when new upgrades are available.
All you have to do is click on it and follow the online instructions.LTS stands for "Long Term Support," meaning the Desktop Edition is supported for three years, and the Server Edition is supported for five years."Supported" means that Ubuntu will continue to provide security and the like until the EOL (End-of-life) date.A generic upgrade guide can be found here, this guide does not mention specific quirks per release.Refer to their own upgrade notes as mentioned below.To avoid damaging your running system, upgrading should only be done from one release to the next release (e.g.