Kubuntu(KDE), Lubuntu(LXDE), Xubuntu(XFCE), Cinnamon and Mate are popular desktop environments for Linux operating systems. If you want to use these desktops, you must install respective operating systems, for example Linux Mint for Cinnamon and MATE, Kubuntu for KDE. You can also install these desktops on Ubuntu, but it will create problems. These installtion will change default settings, Windows and icon set. Once you uninstall these desktop, you may still get same icons sets and windows style. So you need to run some extra commands to reset everything.
A few days ago, i had install Cinnamon. MATE, KDE and LXDE on my Ubuntu 14.04 LTS version. MATE,KDE and LXDE had installed but Cinnamon failed to install. After installation, problems starts to exist, I lost ubuntu icons even in Unity interface, All windows changed to Kubuntu style even in Unity interface, some are not working....Same happen in LXDE.. My system started to run on a mixture of Unity+KDE+Lubuntu.
I had spend 2 days to fix these problems, If you are a Ubuntu user, please use Unity interface, it is better than rest of them except Cinnamon and MATE. Try Linux Mint if you like Cinnamon and MATE. Don't install anyone on Ubuntu. In this article i want to tell How to restore unity login screen after Kubuntu or Lubuntu installation.
1. Open your Terminal, Enter below command
4. Reconfigure lightdm, set lightdm
Restart your system, you can see changes.....
|Ubuntu lightdm login screen|