Changing to bionic works:
| $ juju bootstrap --bootstrap-series bionic --bootstrap-constraints "mem=4G cores=2" azure/southeastasia azure-controller-apac | Creating Juju controller "azure-controller-apac" on azure/southeastasia | Looking for packaged Juju agent version 2.7.6 for amd64 | Launching controller instance(s) on azure/southeastasia... | - machine-0 (arch=amd64 mem=7G cores=2) | Installing Juju agent on bootstrap instance | Fetching Juju GUI 2.15.3 | Waiting for address | Attempting to connect to 20.43.174.134:22 | ...
Changing to bionic works:
| $ juju bootstrap --bootstrap-series bionic --bootstrap- constraints "mem=4G cores=2" azure/southeastasia azure-controlle r-apac controller- apac" on azure/southeastasia asia...
| Creating Juju controller "azure-
| Looking for packaged Juju agent version 2.7.6 for amd64
| Launching controller instance(s) on azure/southeast
| - machine-0 (arch=amd64 mem=7G cores=2)
| Installing Juju agent on bootstrap instance
| Fetching Juju GUI 2.15.3
| Waiting for address
| Attempting to connect to 20.43.174.134:22
| ...