To display or hide hidden files in Ubuntu
You want to delete your Cache or to a specific hidden file, you will learn in the following steps, as you can see, under Ubuntu, the Files.
- Open it in the Filemanager the folder where the hidden files are located.
- Press simultaneously the keys [Ctrl] + [H].
- Alternatively, you can select in the top menu bar "view" > "show Hidden files".
- You want to undo those Changes, repeat step 2 and step 3.

Ubuntu: Show Hidden Files
As you are under Ubuntu/Linux searching for files , or large files find can show you other practical tips.