Hello, I'm following the instructions here:

https://docs.databricks.com/clusters/configure.html?_ga=2.17611385.1712747127.1631209439-1615211488....

to ssh onto the Driver node, and it's working perfectly when I ssh on as `ubuntu@hostname`

but I'd like to ssh on as `root@hostname` and I get this error:

`permission denied (publickey)`

I'd greatly appreciate any help being able to ssh on as `root`. Thank you.