Speeding up Ubuntu: How to remove junk files

Remove Residual Config packages

Residual Config packages are usually dependency packages that are left behind after you uninstall a package from your machine.

1. Go to System -> Administration -> Synaptic Package Manager.
2. On the bottom left hand corner of the window, click the Status button.
3. In the list above the Sections, Status, Search, and Custom buttons, you choose "Residual config".
4. Select all packages (ctrl+A) and mark them for Complete removal. Then hit the
5. Apply button