Simple tool to install your prefered Window Manager and Enviroment for newbies (works on apt-based distros.

DE-WM-installer.sh

#! /bin/bash 
#Check if whiptail is installed
if [ ! "$(which whiptail)" ]; then
	echo -e "whiptail is not installed. Don't worry installing it now."
	#Installs whiptail
  apt install whiptail -y
fi
#For Desktop Manager
wm=$(whiptail --title "Window Manager" --inputbox "Enter Your the Desktop Manager you want to install gdm3, lightdm, sddm etc.  : " 15 40 lightdm 3>&1 1>&2 2>&3)
exitstatus=$?
if [ $exitstatus = 0 ]; then
    echo "Your prefered Window Manager is:" $wm
fi
#For Desktop Enviroment
de=$(whiptail --title "Desktop Eniviroment" --inputbox "Enter Your the Desktop Enviroment you want to install lxqt, gnome-session, plasma-desktop etc.  : " 15 40 plasma-desktop 3>&1 1>&2 2>&3) 
exitstatus=$?
if [ $exitstatus = 0 ]; then
    echo "Your prefered Desktop Enviroment is:" $de
fi
#To install the pair of them
apt update && apt install $de $wm  -y

whiptail --title "Reboot required" --yesno "Installation finished please press <Yes> to reboot your device" 15 40 
echo "rebooting..."
reboot

• Checks if dependencies are installed and if not they are installed automatically
• User-friendly
• Graphical User Interface not required
• Simple
• Everything is done automatically