I am getting the same error since the update yesterday of ubuntu-drivers-common on my Thinkpad T530. I have a dock with 2 DVI, 1 VGA monitor hooked up. I also have one monitor hooked up via a display-port to hdmi cable coming from the laptop itself. It is the dock based VGA monitor that failed to be recognized.
Downgrading to ubuntu-drivers-common 0.2.91.5 fixed the problem.
I am getting the same error since the update yesterday of ubuntu- drivers- common on my Thinkpad T530. I have a dock with 2 DVI, 1 VGA monitor hooked up. I also have one monitor hooked up via a display-port to hdmi cable coming from the laptop itself. It is the dock based VGA monitor that failed to be recognized.
Downgrading to ubuntu- drivers- common 0.2.91.5 fixed the problem.
See also: http:// askubuntu. com/questions/ 519927/ nvidia- driver- not-working- after-upgrade
If any devs would like more information, feel free to ask. Provide cmd/filename for me to upload.