It says: A start job is running for docker application container engine.
After I switch to tty interface, it prompt the error that:

INFO: task systems-journal:348 blocked for more than 120 seconds.   
   Tainted: P OE 4.15.0-43-generic #46-Ubuntu.

echo o> /proc/says/kernel/hung_task_timeout_secs disables this message.

It seems to be Nvidia-docker failed to install.

  • Does sudo dkms status tell you something? Already tried sudo dkms autoinstall? – starkus Dec 28 '18 at 13:09
  • Thanks, I've figured out the problem. It may caused by incompletely installed nvidia driver. Maybe I could try this at next time :) – AlphaGoMK Dec 30 '18 at 7:47

Problem solved after remove and reinstall the nvidia driver, using sudo apt-get purge nvidia* and sudo ubuntu-drivers autoinstall
And make sure you have solved nvidia dependencies.

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