I have Ubuntu running in a VirtualBox VM on both a Windows 7 host and also a Macbook Pro.
Four times now (on two different hosts) after having successfully installed (auto-)updates, and restarted the machine, I get my normal desktop background, but no launcher. I can right-click on the desktop and open up a terminal The terminal window is fixed to to the top left of the desktop, and has no menubar - despite the context menu (right-click) showing the menubar as being enabled.
Alas, almost everything I have tried to do from within the terminal has had precisely no effect. I have tried each and every suggestion I could find from answers to similar issues - eg.:
The only thing that works thus far is running "unity --debug".
Any and all suggestions would be most welcome.
many tias, gary