For example, if you do not have a printer on your parallel port, then you probably do not need the lp module loaded. Similarly, if you want to disable the floppy disk, you can remove that driver, too.
sudo modprobe -r lp
sudo modprobe -r floppy
You can make these changes permanent by removing lp from /etc/modules and adding both lp and floppy to /etc/modprobe.d/blacklist (or blacklist.conf). Alternately, if you need the disk space, then you can just delete the drivers from the system (use modinfo -F filename lp and modinfo -F filename floppy to find the files).
Source of Information : Wiley Ubuntu Powerful Hacks And Customizations
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