How can I remove and re-install Unity?

Unity is misbehaving after installing GLX Dock - HUD does not open with GLX Dock turned off and there are ugly shadows in the panel, three control buttons (close, minimise, maximise) and "Ubuntu Desktop" label when there are no apps running. I have to click the top panel to get the Super key to open the Dash.

I have tried unity --reset and unity --replace commands, but they do not help.

Can I un-install and re-install Unity?

This is what I used when I had a problem with it.

These Commands Will Remove/Uninstall Compiz Unity:

sudo apt-get remove compizconfig-settings-manager
sudo apt-get remove compiz-fusion-plugins-extra
sudo apt-get remove compiz-plugins-extra
sudo apt-get purge compiz*

Then to Re-install Compiz Unity use:

sudo apt-get install unity-2d
sudo apt-get install ubuntu-desktop
sudo apt-get install ubuntu-desktop-2d
sudo apt-get install compizconfig-settings-manager
sudo apt-get install xserver-xgl
sudo apt-get install emerald
sudo apt-get install compiz-fusion-plugins-extra
sudo apt-get install compiz-plugins-extra
sudo apt-get install unity

How can I remove and re-install Unity?

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