First when you install Daryna go to the menu, go to Administration, Restricted Drivers Manager, (the Envy drivers are having alot of issues it seems) and install the restricted drivers for your card, when the drivers are installed it will tell you that you need to restart, but wait for now. Then open a terminal and enter
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sudo apt-get install xserver-xgl
If you want the compiz configuration menu, go to terminal and enter
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sudo apt-get install compizconfig-settings-manager