The best thing in Kubuntu is that it's an official flavour of Ubuntu. Since the desktop environment is KDE, which is a lightweight environment. It gives a seamless experience even on a legacy machine with ram as low as 2gb. For better experience I would recommend to extend your ram upto 4gb. Additionally, it supports all the applications supported on Ubuntu. If you're new to Linux, this OS is definitely a good choice to start with because of it's user friendly ui and good community support.

Kubuntu it's one of my favorites "lightweight" Linux dependencies, working on it you will find many tools that I want to describe here: Kontact it's a mail application where you will find easy integration with Google calendar, RSS Feed, or an intuitive to-do list. Provides a finder where quickly you can have access to all your information stored like your documents or photos. USB flash drives, SD's, or your phone can be connected. Or you can open and read books, documents easily with the document viewer. Surfing on the internet? Yes of course! you got pre-built Mozilla Firefox