Ok, the situation is as follows:

I decided to start using Xubuntu on my old 400Mhz, 128MB RAM computer, so yesterday I downloaded it and started to install. However the CD was corrupt (bad burning I assume) and what was worse I had not other CD's to burn. So I desperately tried to install Xubuntu through netboot but there seems to be some bug, which installs Ubuntu on your machine instead!! (a reported bug I read later)

So Ubuntu (or parts of it?) was installed on the computer, but I actually chose the Xubuntu Desktop when asked in the installation procedures. But the computer still didn't boot into the Xubuntu graphic interface, but a text interface... "sudo aptitude install xubuntu-desktop" seems to solve that. So now when I start my computer I DO get into Xubuntu, but now I have some new problems.

1. I can choose quite some sessions when logging in, including Ubuntu I think (GNOME?)...

2. In the top-bar on the desktop, under "Applications" there is a menu of "Debian" with ALOT of software (e.g. I have the word-processors AbiWord, Emacs, Nano, Mousepad and OO.o!).

3. Checking properties in the Root catalogue shows that i have 90,000+ files taking 3GB of my disk, which seems quite alot for a fresh install.

What should I do? I installed Xubuntu specifically to improve speed on my old computer. Is there any smooth way to get rid of all the unwanted stuff?

All that I can think of is to do

and then install all of the packages you require manually. ie

The packages you see installed are probably shipped with the xubuntu installation anyway, so they are probably supposed to be there (the debian menu sounds funny though, so does gnome).

You could also try re-downloading the iso, and check it with md5sum, to verify its integrity. Then burn it to a cd. I use cd-rw's so I don't get lots of older OS disks lying around, and of course, if you mess the burn process up, you can erase and start again.