Sometimes when installing some packages or modifying a current theme, the Unity launcher and Dash disappear unexpectedly, trying to reboot the system doesn't solve this. After searching for solutions in the Internet, I have found out that reinstalling Unity is the better solution that would restore both Unity launcher and dash.

Press Ctrl+Alt+T to bring up the terminal and run the following command to reinstall Unity:

sudo apt-get install --reinstall unity && sudo reboot

You can also reinstall Unity with this command:

sudo aptitude reinstall unity

sudo reboot

Good luck!

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