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I experienced a similar issue. Turned out to be caused by Private Internet Access client. I had enabled "Start application at login". After disabling this feature, shutdown is almost instant.


If you installed through a package manager through the terminal, then I'm assuming you used apt. In that case, try running sudo apt-get update youtube-dl to update. Let me know if that works.


I had the same problem after upgrading to 16.04. It seems that you need to install gnome-shell, I don't why it was missing from! $ sudo apt-get install gnome-shell Update: It is right that gnome-shell is missing from my Ubuntu 16.04, but the source cause seems to be something else, most probably exhausted memory which I did not have faced wiith Ubuntu 15....

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