"* no JDK or JRE found - please..."
Would seem to indicate you do not have java itself installed. So the output of `which java` would be good. From the dpkg history log you installed java via the oracle-java9-installer, which probably will not work as a JRE/JDK.
"* no JDK or JRE found - please..."
Would seem to indicate you do not have java itself installed. So the output of `which java` would be good. From the dpkg history log you installed java via the oracle- java9-installer , which probably will not work as a JRE/JDK.