Linux Utility: anlayzing disk space

For GUI, JDiskReport - faster than Ubuntu's built-in disk analyzer

http://www.jgoodies.com/freeware/jdiskreport/

Java based.

For console, 'gdu' - https://github.com/dundee/gdu/releases

Go lang.

See, https://www.makeuseof.com/how-to-analyze-disk-usage-with-gdu-in-linux/

Install, 

$ curl -L https://github.com/dundee/gdu/releases/latest/download/gdu_linux_amd64.tgz | tar xz