--image 'ubuntu/ubuntu-xenial-daily-amd64-server-*'
BTW, while this happens to work, it is not quite what you want. This is a regular expression, and you don't want to match on "zero or more dashes". --image 'ubuntu/ubuntu-xenial-daily-amd64-server' is quite enough, though :)
--image 'ubuntu/ ubuntu- xenial- daily-amd64- server- *'
BTW, while this happens to work, it is not quite what you want. This is a regular expression, and you don't want to match on "zero or more dashes". --image 'ubuntu/ ubuntu- xenial- daily-amd64- server' is quite enough, though :)