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OFFLINE pdf UNlocker FOR UBUNTU

If you have pdftk already installed you can skip step1

Step 0: To check if Pdftk is already installed
sudo apt list | grep pdftk 

If output contains '[installed]' tag with pdftk then you can skip step1 i.e if the output is like this
pdftk/xenial 2.02-4 amd64 [installed]

Step 1: Install pdftk
sudo apt-get install pdftk

Step 2: Run following command
pdftk /path/to/input.pdf input_pw <yourpassword> output out.pdf