If you are a GNOME user, you've something called Baobab (a.k.a Disk Usage Analyser) to analyse the disk usage available by default. You can run it from System> Administration >Disk Usage Analyser.

It's similar to KDirStat. It scans the entire file system or a specific directory provided by you (local a remote). The output for the entire file system scan is shown in Figure 3. The output contains the directory tree, size and the total number of objects. It also displays the size for hard links that exist in a particula: directory.