I updated today from Ubuntu 14.04 to 16.04 via the official client. I did everything as recommended and let it remove the outdated packages in the end. After the first restart it said that there has been an "internal error" and I had no Unity menu nor a taskbar or anything similar. The only way for me to open Firefox was by opening a picture with Firefox that I had on my desktop. I cant minimize or close the window with my mouse, only with Alt+F4.
So if someone would tell me what to do, I'd be very grateful
Greeting
Vitus