[ubuntu] jacoco não gera o pasta site e nem o relatório nem apresenta erro

acho que deve ser um problema de configuração, o eclipse e o terminal não apresentam erros, tem algumas alterações que fiz nos programas para tentar corrigir.

segue o pom.wml ;

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>br.com.alura.maven</groupId>
    <artifactId>produtos</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>produtos</name>
    <url>http://maven.apache.org</url>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.6.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
        <dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.12</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.jacoco/jacoco-maven-plugin -->
        <dependency>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>0.8.5</version>
        </dependency>

    </dependencies>
    <build>
    <pluginManagement>
        <plugins>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-pmd-plugin</artifactId>
                <version>3.6</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>check</goal>
                        </goals>
                        </execution>
                </executions>
                </plugin>

                <plugin>
                    <groupId>org.jacoco</groupId>
                    <artifactId>jacoco-maven-plugin</artifactId>
                    <version>0.7.6.201602180812</version>
                    <executions>
                        <execution>
                            <goals>
                                <goal>prepare-agent</goal>
                                <goal>report</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

            </plugins>
        </pluginManagement>
    </build>
</project>

e o resultado no terminal

[INFO] Scanning for projects...
[INFO] 
[INFO] --------------------< br.com.alura.maven:produtos >---------------------
[INFO] Building produtos 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ produtos ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/brito/eclipse-workspace/produtos/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ produtos ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ produtos ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/brito/eclipse-workspace/produtos/src/test/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ produtos ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ produtos ---
[INFO] Surefire report directory: /home/brito/eclipse-workspace/produtos/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running br.com.alura.maven.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.009 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ produtos ---
[INFO] Building jar: /home/brito/eclipse-workspace/produtos/target/produtos-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.928 s
[INFO] Finished at: 2020-05-09T01:06:26-03:00
[INFO] ------------------------------------------------------------------------