Can't run cells in Polynote - any ideas?

Question

The installation (on ubuntu) seemed to go well, but when I try to run a cell (python or scala) I get:

scala.reflect.internal.MissingRequirementError: object java.lang.Object 
in compiler mirror not found.

What am I missing here?

Answer 1

Downgrading to Java 8 worked for me:

sudo apt-get install openjdk-8-jre
sudo update-alternatives --config java

choose java 8 and restart polynotes