Disk Usage Analyser
Shows what's taking up space on your drives.
Installs from Ubuntu's own software archive.
Looking for WizTree on Linux? Disk Usage Analyser does the same job for free, and TuxPick installs it for you.
Install Disk Usage Analyser with TuxPickIt works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.