You can also find metadata even in unprocessed files using things like /Author and /Title. Command Line Magic The qpdf tool can convert a PDF file to another PDF file.

Since Ubuntu is a Linux operating system, you can bypass the graphical user interface entirely and open your PDF files from the command line.

In the download: Linux 101: How to give users sudo privileges on Ubuntu and Red Hat-based Linux distributions Linux 101: How to search for files from the Linux command line ...

A compilation of essential commands for searching, monitoring and securing Linux systems - plus the Linux Command Line Cheat Sheet.