About a month ago, I follow the instruction from here installed some components to make my desktop like OS X.

Unfortunately, I realize that the Cairo-Dock is damn annoying. When I want to click on it, it un-focus; when I don't want to use it, it focus again. wtf!!!

Thus I decided to remove it.

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# change the left dock icon back to ubuntu icon
$ wget -O ubuntu-logo.zip http://goo.gl/mU42p

$ sudo unzip ubuntu-logo.zip -d /usr/share/unity/6/
# It will ask to replace file, Type "A" and Press enter

$ rm ubuntu-logo.zip

# Uninstall Mac cursor
$ cd /usr/share/icons/mac-cursors
$ ./uninstall-mac-cursors.sh

# Enable back the crash report
$ cd
$ sudo sed -i "s/enabled=0/enabled=1/g" '/etc/default/apport'

# Finally, remove the cairo-dock
$ sudo apt-get purge cairo-dock cairo-dock-plug-ins && sudo apt-get autoremove

Lastly, change back to Ubuntu original theme.
Search for appearance

Search for appearance

Change the theme

Change Theme

References: