Hi, I just used Synaptic Package Manager (install from Software or via Terminal:
sudo apt-get install synaptic
Then search for KDE - mark it for installation, then select Apply - it should advise you that it wants to install a whole lot more so accept and install - I do have an annoying Kwallet that keeps coming up though every time I want to add a wallpaper and it is quoting an email address that I have recently stopped using!
Never installed it in the OS apart from Thunderbird so don’t know how it is picking up my defunct email address … unless… I’ve been hacked! 








