Apparently, its that time of the year again when an update breaks ubuntu. This year after a routine update Ubuntu 18.04 LTS gets stuck at the splash screen. (Please note that I was not upgrading to LTS 18.04. I did that months ago. This was a routine software update.). I've tried booting to recovery mode and was presented with a root log on which I could not use because I hadn't created a root user.
Update
The bootup process does eventually proceed past the splash screen after a loooooong time.
haveged
package. – Organic Marble Jul 05 '18 at 20:14