Comment 1 for bug 1626784

This seems strange to me. There is no indication what the rc2 binary is.

I'm taking a wild stab in the dark and assuming it is a build of master as of rc2 time.

Specifying a particular version when said version doesn't exist in streams is a bit strange.
I'd expect the following to work better:

  $ rc1/bin/juju bootstrap --constraints mem=2G charm-test lxd/localhost
  $ rc2/bin/juju upgrade-juju -m charm-test:controller