How to install UNR on existing Ubuntu

[Gabriel S. Coonce]

>
> Well, actually, Ive already done that (installed package ubuntu- 
> netbook-remix), but it didn't show up under sessions when logging in  
> and going into GNOME has it so when I move the mouse, the laucher  
> appears for a sec, the vanishes. And I didn't find any desktop  
> switcher so I unistalled it. I assume I've done something wrong.