If you use Ubuntu with [MATE DE](http://mate-desktop.org/) ([Ubuntu MATE](http://ubuntu-mate.org/)) you can use `MATE Disk Usage Analyzer`:

* its icon is located in *Applications->System Tools*
* it is a part of [`mate-utils` package](https://packages.ubuntu.com/xenial/amd64/mate-utils/filelist)
* its executable is named `mate-disk-usage-analyzer`
* its screenshot is presented below:

   [![MATE Disk Usage Analyzer][1]][1]

   even on latest 18.04 LTS it looks traditionally nice.

  [1]: https://i.stack.imgur.com/IoZEa.png