Automator can be really useful to those that take the time to use it. It can be slow to set up a new workflow initially but what a time saver.
Happily, Automator is really just a visible way to interact with lots of little tools on your computer, which is how most Linux apps work anyway. I don’t know of a GUI alternative in Ubuntu (yet), but anything that can be done in Automator can be done in Linux… and more since Automator support is somewhat limited, even in the apps from Apple.
Start from scratch and script it out...