I make music and sounds for video games. Which software should I install on Ubuntu Studio for this purpose?
Generally, Ardour is the go-to DAW for Linux. As for software with more specific purposes, I would just search through the software center for whatever you're looking for and see which one you like best- maybe starting with the ones with higher ratings.
It is easier, with Linux, to take a more modular approach to music and sound development by using jack.