Just for reference:
I had the same problem on my digital ocean droplet (after a distro upgrade).
Problem solved after upgrade the kernel in the digital ocean administration site. More details you can see here[1].
In my case the upgrade was from 3.x to 4.x serie.
[1] https://www.digitalocean.com/community/tutorials/how-to-update-a-digitalocean-server-s-kernel
Just for reference:
I had the same problem on my digital ocean droplet (after a distro upgrade).
Problem solved after upgrade the kernel in the digital ocean administration site. More details you can see here[1].
In my case the upgrade was from 3.x to 4.x serie.
[1] https:/ /www.digitaloce an.com/ community/ tutorials/ how-to- update- a-digitalocean- server- s-kernel