ros_installation.txt

 # 1-create folder on the desktop
 rawda@rawda:~$ mkdir Ros
 
 # 2-go inside the dir
 rawda@rawda:~$ cd Ros

 # 3-create bash file
 rawda@rawda:~/Ros$ touch ros_installation.sh

 # 4-change bash file permission
 rawda@rawda:~/Ros$ chmod 742 ros_installation.sh

 # 5-open bash file and copy this commads
 #! /usr/bin/bash

 sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" >
 /etc/apt/sources.list.d/ros-latest.list'

 sudo apt install curl

 curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -

 sudo apt update

 sudo apt install ros-noetic-desktop-full

 echo "source /opt/ros/noetic/setup.bash" >> ~/.bashrc

 source ~/.bashrc

 source /opt/ros/noetic/setup.bash

 sudo apt install python3-rosdep python3-rosinstall python3-rosinstall-generator python3-wstool build-essential

 sudo apt install python3-rosdep

 sudo apt install python3-roslaunch

 sudo rosdep init

 rosdep update

 # 6-run the bash file 
 ./ros_installation.sh

 # 7- to make sure ros1 install
 rawda@rawda:~/Ros$ printenv | grep ROS
 ROS_VERSION=1
 ROS_PYTHON_VERSION=3
 ROS_PACKAGE_PATH=/opt/ros/noetic/share
 ROSLISP_PACKAGE_DIRECTORIES=
 ROS_ETC_DIR=/opt/ros/noetic/etc/ros
 ROS_MASTER_URI=http://localhost:11311
 ROS_ROOT=/opt/ros/noetic/share/ros
 ROS_DISTRO=noetic