Try this:
wget -c https://streams.canonical.com/juju/tools/releases/juju-1.20.11-trusty-amd64.tgz
sudo mkdir -p /var/www/html/juju-metadata/tools/releases
mv juju-1.20.11-trusty-amd64.tgz /var/www/html/juju-metadata/tools/releases
sudo juju --debug metadata generate-tools -d /var/www/html/juju-metadata
sudo chmod 644 /var/www/html/juju-metadata/tools/streams/v1/*
Now in your ~/.juju/environments.yaml file you will need to specify the URL of your newly shared tools:
default: maas
environments:
maas:
type: maas
maas-server: 'http:///MAAS/
maas-oauth:
tools-metadata-url: http://YOUR IP/juju-metadata/tools`