Install Bleachbit to help remove temporary files, browser cache files, etc. This program is available for various flavours of Linux and if (like me) you have a EEEPC with a 4GB HDD then it is a big help.
sudo apt install bleachbit
There are certain files that Bleachbit could not remove, around 4000 localisation files could not be removed although it said that they were removable.
I would reccomend using this program, to be able to clean the .deb files I mentioned last time you need to run Bleachbit as root. If you do not have such a menu entry open a terminal window and type in