Hi, open synaptic package manager and search for xscreensaver. you will get a list of packages. already installed should be xscreensaver and xscreensaver-data. these will give you the defaults as shipped with mint. for additional screensavers install the following. However if you wish to use GL screensavers you need 3D acceleration enabled graphics drivers installed or they will fail to run or lock your system up:
A fact is a simple statement that everyone believes. It is innocent, unless found guilty. A hypothesis is a novel suggestion that no one wants to believe. It is guilty, until found effective.