I install Xfce on my Whonix and now need to change it back for KDE.
How to bring back KDE desctop saving all my current settings, and especially bring back all original KDE settings that was there from the beginning?
Kde shouldn’t be gone, unless you uninstalled it. All you need to do is changing back to display manager kdm in this case.
sudo apt-get update
sudo apt-get install --reinstall kdm
sudo dpkg-reconfigure kdm