If you are wondering why your hard disk space is getting lesser and lesser and yet you did not install that many applications on your system, most probably you are wasting your disk space on the cache and temporary files.
BleachBit is a software for Linux that scans your computer and deletes unnecessary files to free valuable disk space, maintain privacy, and remove junk. It supports a wide variety of applications and is able to rid your system of old clutter like cache, cookies, Internet history, localizations, logs, temporary files, and broken shortcuts.
Download the Bleachbit installer for your distro. If you are using Ubuntu Jaunty, you can install it directly from the repository.
Once you have installed Bleachbit, go to Applications->System Tools. You will see two options: Bleachbit and Bleachbit as Administrator. As its name implies, opening Bleachbit as Administrator allows you to clean up and delete files from the system folder.
The left pane of the Bleachbit window shows the list of applications that it supports. Put a check on those applications that you want to clean up (Cleaning up doesn’t mean uninstallation, it only deletes the cache files created by the applications). Click on the Preview button to see the files that will be deleted. You can also scroll down to the end of the list to see the amount of disk space it going to free up once all the cache/temporary files are deleted.
Once you are done with the preview, click on the Delete button to wipe out all the cache files.