>>how can i remove the programs that i set up them with "sudo apt-get
isntall" form the hard disk?
thx

I can't help with tremulous as I have never played it.

If apt-get works then the same thing can be done from Synaptic. You do not NEED
to use the commandline. However, if you want to then you can.

Synaptic can remove programmes installed with apt-get. You open Synaptic from
System, Administration, Synaptic. You search (not quick search) for tremulous
and it will show as a green coloured box. That shows that it is installed. Right
click on the green box and choose Mark for Removal (you can also tell it to
Completely Remove which removes the config files as well). Then when you have
marked all of the ones that you want to remove then click the Apply button. It
will review the changes. Then you can tell it to apply them once again. This is
just a last chance to back out.

You can do the same thing from the terminal as you did to install them but
instead of install type remove such as: sudo apt-get remove tremulous. If you
want to completely remove it then you use the purge switch which goes like this:
sudo apt-get --purge remove tremulous This removes all traces of tremulous.

If you used dpkg to install the programme then you type: sudo dpkg --purge
<package>

I think that Synaptic is easier, but it is up to you.