"juju remove-relation XXX-extra-packages XXX"
gives:
"ERROR Unsupported attempt to destroy subordinate service 'XXX' while principal service 'XXX-extra-packages' is related"
"juju remove-relation XXX-extra-packages XXX"
gives:
"ERROR Unsupported attempt to destroy subordinate service 'XXX' while principal service 'XXX-extra- packages' is related"