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

It is possible to open a Command Prompt with Administrator privileges that allows you to run any command that you wish, even those that require elevated privileges. Here's how to open a ...

MS-DOS allows the user to navigate, open, and otherwise manipulate files on their computer from a command line instead of a Graphic User Interface (GUI) like Windows.

Jack Wallen continues his Linux 101 series, with an introduction on how to copy files and directories from the command line.

If you have trouble finding files in your Linux distribution, there's a built-in command line tool that makes your job much easier.

Learn how to copy files using Command Prompt (copy and xcopy). You can also use parameters to perform some specific tasks while copying.

Jack Wallen shows you how to locate files on the Linux directory hierarchy using the find command.

There's a lot to learn about image files on the command line, from verifying file format to finding out where and when photos were taken and maybe even getting an unusual view of what they look like.

From the command line, type "backup.bat" and the batch file will run your specified commands: first, copying all files from that directory, then renaming them to remove the extensions.