I have used ncdu for a long time, and it's good if you have time to wait for it to get sizes, if you can't, Duc AKA "Dude, where are my bytes" has caching and i

I have used ncdu for a long time, and it's good if you have time to wait for it to get sizes, if you can't, Duc AKA "Dude, where are my bytes" has caching and is ready to apt install on Debian and Ubuntu repos https://duc.zevv.nl https://duc.zevv.nl and it has different GUI options. It's slightly more complex but for larger volumes I use it instead of ncdu.