Re: [Trisquel-users] Need help with program installation

[lddimov]

I am still very inexperienced with Trisquel, but to my knowledge, if it is  
not available through the repositories, that's probably because it is not  
free (Libre) software.

As far as manuals to learn using the terminal, try this:  
http://en.flossmanuals.net/_booki/terminal/terminal.pdf

If you don't like pdf format, it is also here:  
http://en.flossmanuals.net/terminal/

That site http://en.flossmanuals.net/ seems to have lots of free manuals.