I've had this for at least 4 weeks with 16.04.1. It seems like it started after I had to downgrade nvidia-* due to https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-304/+bug/1639180 and tried various things like installing gnome-flashback and Gnome3. To be clear Unity is what I select on the login screen.
I've had this for at least 4 weeks with 16.04.1. It seems like it started after I had to downgrade nvidia-* due to https:/ /bugs.launchpad .net/ubuntu/ +source/ nvidia- graphics- drivers- 304/+bug/ 1639180 and tried various things like installing gnome-flashback and Gnome3. To be clear Unity is what I select on the login screen.