I am a Ubuntu newbie. I followed this tutorial to install Gnome 3 on my Ubuntu Precise Pangolin.
I was expecting a desktop like this:

and I ended up with a desktop like this:
Please tell me what I can do to get the desired desktop.
NB: I have dual-booted using Wubi.

gnome-shell. – muru Aug 02 '14 at 11:29Window manager warning: Screen 0 on display ":0.0" already has a window manager; try using the --replace option to replace the current window manager.– An SO User Aug 02 '14 at 11:31replaceoption?gnome-shell --replace? – muru Aug 02 '14 at 11:37