If you don’t like new “natty” desktop in ubuntu 11.4 then ubuntu give’s you option to change back to old desktopi will show you how change …
Go to Applications > system application> login screen settings > then Click on unlock button
Give you password
and select ubuntu classic as you default session
<tr>
<td class="tr-caption" style="text-align: center;">
click on UNLOCK
</td>
</tr>
<tr>
<td class="tr-caption" style="text-align: center;">
select UBUNTU as default session
</td>
</tr>
thats all …
Logout and login back …