Ubuntu 16.04 won’t boot – stuck at failed to start clean up any mess left by 0dns-up

Hi my Ubuntu won’t boot and is stuck at

[FAILED] Failed to start clean up any mess left by 0dns-up

As per the answer to this question, I’ve tried

sudo apt-get update || sudo apt-get install -f || sudo apt-get upgrade || sudo dpkg --configure -a 

but it still doesn’t work.

Failed to boot enter image description here

The second image is what I got after typing “systemctl status dns-clean.service”