Step:1- Insert OS Bootable Pendrive, Power On your Computer, then Press F12
Step:12- Select Start
now open a new terminal (CTRL+ALT+T) Method 1
sudo apt-get update
sudo apt-get install gscan2pdf
if Method 1 is not working try Method 2
Method 2
sudo apt-add-repository ppa:jeffreyratcliffe/ppa sudo apt update sudo apt install gscan2pdf