Ubuntu users can usually install QDirStat through the distribution repository, which is the least complicated option for dependency handling and future removal. The package version depends on the Ubuntu release you are running.
After installation, begin with a directory inside your home folder. This avoids unnecessary permission prompts and helps you learn the tree, treemap and file-type panels before scanning larger mounted filesystems.
Install QDirStat from Ubuntu repositories
Refresh package information
Run the normal package metadata update, then install qdirstat. Read the package manager summary before accepting any additional dependencies.
Confirm the installed package
Use the package manager to view the installed version and origin. This is useful when comparing a repository build with upstream documentation.
Start with a safe first scan
Choose your home directory
A home-directory scan reveals downloads, media, caches and development folders without requiring root access.
Read the treemap with the tree
Select a large rectangle, then confirm its path and parent directory in the tree. The visual size is useful, but the path provides the context needed for a cleanup decision.
Handle Ubuntu permission messages
Do not default to sudo
Permission warnings are expected when a regular account cannot read protected paths. Running the complete graphical session as root raises the risk of an accidental destructive action.
Check mounted volumes
External drives can use ownership or mount options that block access. Confirm that the same user can list the target directory in the terminal.
Repository package or source ZIP?
Choose stability
Stay with Ubuntu packages when you value predictable updates and integration.
Choose source deliberately
Use the source ZIP when you need a specific upstream change and are prepared to maintain the build yourself.
Next steps
Return to the main QDirStat page for the source archive, compatibility summary and twenty-question FAQ, or continue with a related guide below.