I have Ubuntu 16.04 running on virtualbox. I did install guest additions from the host. While I was troubleshooting a black screen of death, I had set it to boot to console.
Now. I don't remember how can I restore the boot to start lightdm automagically. I currently have to run
$ sudo service lightdm start
$ sudo killall Xorg
on a console before I can actually use it. lightdm gives me a black screen on tty7 until I kill Xorg. I have no idea why that happens.
