Hi @gabriele.faelli, to fix it on your instance, edit the following file:
/root/.nami/components/com.bitnami.jenkins/helpers.js
Modify the following line:
env: {JENKINS_HOME: $app.homeDir},
To this:
env: {JENKINS_HOME: $app.homeDir, HOME: $app.homeDir},
After restart Jenkins and it should work properly:
sudo /opt/bitnami/ctlscript.sh restart jenkins
We also wanted to let you know that the revision of the Bitnami Jenkins stack was already released, in case you prefer to launch the new instance with the data.