Can’t say I’m a fan either 
The weekly Digital Ocean backup from 7x days ago, which I restored, has also put the Ubuntu 18.04 operating system back, so I’m now pre-upgrade once again.
Database restore looks like it was successful.
I’m just taking another fresh snapshot now - just in case.
If all this works and gets us back online, I can then look at doing a rsync move to the latest OS - but at my leisure rather than in a rushed panic 