On Thu, Dec 01, 2016 at 06:38:45PM +0000, Rodolfo Medina wrote:
> Suppose that, during months and years, you have installed many packages in
> Debian system that you no more want and no more use, and that you want to free
> some space on disk because your machine is old with a small hard disk. The
> problem is what packages you can be really sure and safe to remove.
At some point you actually have to *know* what a package does. Go through
the list sorted by size and skip everything you know is useful. When you
get to one that you think is not useful, or which you don't recognize
*at all*, dig into it and find out what it does. Then consider removing
it, but be prepared to put it back if you break something.
This is how you learn.
P.S. http://wooledge.org/~greg/ds will sort the installed packages by
size for you. As you can see, many of us have been there, done that.
P.P.S. do this learning on your desktop box, not a server.