I experience exactly the same bug after daily upgrade of my 16.04 this morning: my mouse middle button no longer works (LOGITECH M557, Bluetooth, running 4.4.0-22-generic #40-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux).
I experience exactly the same bug after daily upgrade of my 16.04 this morning: my mouse middle button no longer works (LOGITECH M557, Bluetooth, running 4.4.0-22-generic #40-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux).