How to change gdm or sddm to lightdm


First, we will install everything necessary to have lightdm in our system. To do this, from the terminal:

sudo pacman -S lightdm lightdm-gtk-greeter rebornos-lightdm-gtk-greeter-images lightdm-gtk-greeter-settings


Then we will customize the access. To do this, from the terminal:
sudo echo "[greeter]" >> /etc/lightdm/lightdm-gtk-greeter.conf
sudo echo "theme-name = Flat-Plat-Blue" >> /etc/lightdm/lightdm-gtk-greeter.conf
sudo echo "icon-theme-name = Flat-Remix-Green" >> /etc/lightdm/lightdm-gtk-greeter.conf
sudo echo "background = /usr/share/pixmaps/rebornos.jpg" >> /etc/lightdm/lightdm-gtk-greeter.conf
sudo echo "default-user-image = /usr/share/pixmaps/avatar.png" >> /etc/lightdm/lightdm-gtk-greeter.conf


NOTE 1: If KDE or GNOME is installed with ISO RebornOS-2020.08.22-x86_64.iso (testing ISO only present in Sourceforge) or newer, the above steps are unnecessary as it will be installed by cnchi.

NOTE 2: In the case of installing lightdm in PLASMA, there is one more step to follow:
We must create the ksplashrc file in ~/.config. This is done from the terminal with (In this case we will not use sudo):
nano ~/.config/ksplashrc

Inside copy the following:
[KSplash]
Engine=none
Theme=None

Save (Ctrl + o) and exit (Ctrl + x).


(1). In the case of changing gdm to lightdm if we use GNOME:
We will have to disable gdm, and enable lightdm. To do this, from the terminal:
sudo systemctl disable gdm
sudo systemctl enable lightdm

If we want to disable lightdm, and re-enable gdm to use GNOME as it comes by default, then from the terminal:
sudo systemctl disable lightdm
sudo systemctl enable gdm


(2). In the case of changing sddm to lightdm if we use KDE:
We will have to disable sddm, and enable lightdm. To do this, from the terminal:
sudo systemctl disable sddm
sudo systemctl enable lightdm

If we want to disable lightdm, and re-enable sddm to use KDE as it comes by default, then from the terminal:
sudo systemctl disable lightdm
sudo systemctl enable sddm


NOTE: When start KDE with lightdm, the KDE panel is unconfigured. To correct it, we can remove this panel, and add a default panel.