You might want to begin here:
<http://www.httrack.com/html/fcguide.html>
thn come back to the forum when you have more specific questions.

I don't use the command line myself or I would try to offer a simple
solution.

I'm not *nixed enough myself to tell you which is comptible with your Ubuntu,
but you might want to consider trying one of the WebHTTrack editions here:
<http://www.httrack.com/page/2/en/index.html>