In order to run the bnsupport, you should log in to the server console (refer to the FAQ for more information) and run the Bitnami Support Tool executing the following command:
If your stack does not include the tool, you can download the latest version running:
wget -O bnsupport-linux-x64.run https://downloads.bitnami.com/files/bnsupport/latest/bnsupport-linux-x64.run
sudo mv bnsupport-linux-x64.run /opt/bitnami/
chmod +x /opt/bitnami/bnsupport-linux-x64.run
Once installed, you can execute it running the first command of the post.
Please let us know if this solves the issue.
Carlos R. Hernández