I installed lubuntu-desktop on Ubuntu to try and later removed all the packages of lubuntu-desktop. The problem occurred that the boot screen become boot screen of lubuntu instead of Ubuntu. Again still there is a option in log in screen to use lubuntu and lubuntu-qt sessions and these two options result only blank screen . So can anyone help me to remove these options from login option and to revert the booting screen back to default Ubuntu boot screen.
You need to have at least one of the *buntu-desktop packages installed. This pulls in all the other packages required for a desktop session.
So try:
To get the Ubuntu boot logo, you need to install the package
plymouth-theme-ubuntu-logo