I must have done something wrong. I un-installed Nginx and PHP-FPM using apt-get purge. When I did a reboot, the theme changed from Ambiance to High Contrast. Also the Audacious player is also gone. The Ambiance theme is not available anymore from the settings. How can I get the Ambiance theme back? thanks. I am using Ubuntu 13.10. I hate the High Contrast theme.
Open your terminal and type as
sudo apt-get install light-themes audacious
Then restart your system.
From theme manager you can now choose ambiance theme and audacious also installs.
Hope that helps.
You need to install the packages
dmz-cursor-theme for the ambiance theme.