You have downloaded and installed a Ubuntu distribution based on Gnome, the default graphical environment, but you prefer the KDE . Although there is a distribution with KDE preinstalled, Kubuntu, it is possible to add the GUI KDE on a Ubuntu equipped with another interface. This tutorial explains how to add the graphic environment KDE on a Ubuntu distribution with another environment or on a minimal Ubuntu basis (without a graphical interface, just the console like Ubuntu Server).
You can have several graphic environments coexist and choose at the login of the start on which you want to work. However, it is not recommended to install and use several interfaces, each with specific packages and software. In addition to the KDE Plasma, we could also try Xfce, LXDE Budgie, Mate, LXQt….
Two possibilities to add KDE : set up KDE minimal , just the desktop manager but without the related applications, or KDE complete , i.e. the desktop manager and all software in the suite KDE (Amarok, Dolphin, Konqueror, Kopete, etc). The second method will transform Ubuntu into Kubuntu, the distribution delivered originally with the environment KDE .
When you come from the Microsoft world, Kubuntu / KDE is the closest to Windows with a Start menu (which now opens with the Windows key on the keyboard). A way to make a smooth transition to freedom!
Add to the list KDE minimum at Ubuntu
1. Open a console on the Ubuntu computer or a connection SSH remote.
2. Type the following command to install the environment only KDE :
sudo apt install plasma-desktop
3. A message about the default X server may appear. Specify which one to use by default ( lightdm for kde).
4. Restart the computer (sudo reboot for example).
Install KDE complete on Ubuntu
1. Open a terminal on the PC Ubuntu or a connection SSH remote.
2. Type the following command to install the environment KDE and all the software KDE :
sudo apt install kubuntu-desktop
3. If a screen appears for choosing the default X server, indicate the one for KDE ( lightdm ) or the old one.
4. Restart the computer.