After installing and using Ubuntu 11.10 for while I decided to install gnome shell. After Installing and rebooting my system I saw that Ubuntu light theme (ambiance/radiance) is gone.
/usr/shar/icons, it seems that the light themes and mono icons exist. I even reinstalled
gtk3-engine-unico package but none of these effort fixed my problem :(
my desktop now looks like this:
What should I do to get my default ubuntu theme back?