The reason it works in the LiveCD is probably because you're using a
different driver there (the open source 'nouveau' driver). So a solution
here might just be to uninstall the nvidia-440 driver.
** Summary changed:
- Display Interfaces Not Detected
+ [nvidia][Lenovo P51] Mini-DP and HDMI ports
Your mini-DP and HDMI ports are probably connected to the Nvidia GPU so
this is something of a bug in the Nvidia driver, or a misconfiguration.
** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-440
(Ubuntu)
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