DDClient - by WhoCares - I hope this one will work

herko wrote:
it's probably got something to do with the /etc/apt/sources.list file, where I need to add a bunch of new sources.

Your current sources.list file contains a line that begins with a "#" character. Removing the "#" character from that line is probably all you need to do.

herko wrote:
However, to be able to edit that file, I need to install a text editor like vim or nano or pico or vi.

You should already have vi. Try this:

vi /etc/apt/sources.list

To exit vi without saving changes you've made, hit ESC and then type :q! -- more vi instructions are here: http://www.lagmonster.org/docs/vi.html

Once you've changed your sources.list file, do another apt-get update, then try apt-get install ddclient again.

Afterward, you can install nano by typing apt-get install nano ... But learning at least the basics of vi is worthwhile because it'll be available on every Unix you encounter.