How to check the failed login history of your linux server

 lastb command is used to check the failed login history in Linux.

usage   :

$ sudo lastb

How to make pdf file from multiple Image files in Ubuntu

 

If you have multiple image files and you want to make a single pdf file from it, just follow the steps

This GUI tool convert multiple image files to a single pdf file in Ubuntu linux

open terminal (Ctrl+Alt+T)

$ sudo apt install gscan2pdf