/usr/lib/jvm/java-11-openjdk-amd64/conf/ is in openjdk-11-jre-headless 10.0.1+10-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/jvm/java-11-openjdk-amd64/conf/logging.properties
/usr/lib/jvm/java-11-openjdk-amd64/conf/management/
/usr/lib/jvm/java-11-openjdk-amd64/conf/management/jmxremote.access
/usr/lib/jvm/java-11-openjdk-amd64/conf/management/management.properties
/usr/lib/jvm/java-11-openjdk-amd64/conf/net.properties
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/java.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/java.security
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/nss.cfg
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/README.txt
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/limited/
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/limited/default_US_export.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/limited/default_local.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/limited/exempt_local.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/unlimited/
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/unlimited/default_US_export.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/security/policy/unlimited/default_local.policy
/usr/lib/jvm/java-11-openjdk-amd64/conf/sound.properties