Question: I have already installed Windows XP Service Pack 3 and downloaded the sound and display driver from the manufacturer website but when I try and install it, I get an error message that it was not successfully installed and it demand Windows XP Service Pack 3 CD. 

I don't have the Windows XP service pack 3 CD. 

Is there any other way to sort this issue? 

Thank you.

Answer: 
You must run this as sudo:

```
# add-apt-repository ppa:gnome3-team/gnome3 && apt-get -f update
# apt-get -f install gdm gnome-shell gnome-tweak-tool

```

You will be asked to configure the display manager and you must choose gdm (however there is no need to uninstall lightdm, I still use it because I'm running plymouth).

Once you restart, you will see the gdm login screen, and there you can choose gnome instead of unity. This also means that you can leave that desktop environment, so you can switch to it whenever you want.

Then you will be under gnome3 desktop environment, which is quite raw, so I recommend you to install some useful extensions to improve gnome3 behavior → <http://extensions.gnome.org/>
<http://www.webupd8.org/2013/03/gnome-38-beta-available-in-ppa-for.html>

I believe you can always go back to unity on login screen as well as uninstall installed packages.