/usr/share/gradle/lib/plugins/ is in libgradle-plugins-java 3.4.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gradle/lib/plugins/gradle-announce-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-antlr-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-build-comparisn-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-build-init-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-code-quality-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-dependency-management-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-diagnostics-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-ear-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-ide-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-ide-native-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-ivy-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-jacoco-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-javascript-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-jetty-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-language-groovy-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-language-java-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-language-jvm-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-language-native-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-language-scala-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-maven-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-osgi-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-platform-base-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-platform-jvm-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-platform-native-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-platform-play-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-plugin-development-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-plugin-use-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-plugins-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-publish-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-reporting-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-resources-http-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-resources-sftp-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-scala-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-signing-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-test-kit-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-testing-base-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-testing-jvm-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-testing-native-3.4.1.jar
/usr/share/gradle/lib/plugins/gradle-tooling-api-builders-3.4.1.jar