I use Debian 9 with Xfce, amd64. After updating from 4.9.0-6 to 4.9.0-7 the lightdm service fails to start.
lightdm.log complains about:
Loading users from org.freedesktop.Accounts User /org/freedesktop/Accounts/User1000 added Process 650 exited with return value 1
NVIDIA: Failed to initialize the NVIDIA kernel module... No devices detected.
But the dmesg shown nothing suspicious about it.
Network drivers seem to stop functioning properly as I have no connection over Wi-Fi or Ethernet despite network-manager up and running.
I can however login into 4.9.0-6 successfully. What should I change in 4.9.0-7?
EDIT: As per recommendation, I installed kernel headers for the updated version and re-run Nvidia driver installer.