I've also been hit by this critical bug on my Thinkpad T550 (intel graphic card). The symptom was that I had a very low resolution on boot ; Xorg logs showed it was using vesa ! Then I installed the package linux-image-extra-4.4.0-43-generic and everything went back to normal.
I've also been hit by this critical bug on my Thinkpad T550 (intel graphic card). The symptom was that I had a very low resolution on boot ; Xorg logs showed it was using vesa ! Then I installed the package linux-image- extra-4. 4.0-43- generic and everything went back to normal.