I have tried to experiment with different desktop environments. I completely removed Ubuntu-desktop-environment and installed Kubuntu-desktop. Then after some days I installed Lubuntu-dektop.
Now, I want to get back to my Ubuntu-desktop. How to do it?
Update: I have done the following:
sudo apt install ubuntu-desktop
sudo apt-get install ubuntu-gnome-desktop
sudo apt-get install gnome-shell
And as a result I have got many options to login with. But When I choose Ubuntu after reconfiguring into
lightdm it says insufficient memory.