Use isto para remover / desinstalar o Compiz Unity:
sudo apt-get remove o compizconfig-settings-manager
sudo apt-get remove compiz-fusion-plugins-extra
sudo apt-get remove o compiz-plugins-extra
sudo apt-get purga compiz *
Em seguida, reinstale o uso do Compiz Unity:
sudo apt-get instala a unidade-2d
sudo apt-get instala o ubuntu-desktop
sudo apt-get instala o ubuntu-desktop-2d
sudo apt-get instala o compizconfig-settings-manager
sudo apt-get instala xserver-xgl
sudo apt-get instala emerald
sudo apt-get instala o compiz-fusion-plugins-extra
sudo apt-get instala git compiz-plugins-extra
sudo apt-get instala o compiz-plugins-extra
sudo apt-get install unidade