I'd like to use Action Replay Powersaves, but my computer is running Ubuntu and the official website has only downloads for Windows and Mac.
I guess you won't get far with it.
You may want to use
wine, which will emulate a Microsoft operating system and start the Action Replay software in it.
You will have to look up for a tutorial how to create an environment for your desired deeds. But
wine is really easy to go with.
Though I have one of these Action Replays myself here, I unfortunatelly don't have enough time to test it myself. Never used it though. Why have I even bought it?