I only see the following output from sudo ubuntu-emulator create --help
Create new emulator instance named 'name':
--channel= Select device channel (ubuntu-touch/devel)
--server= Select image server (https://system-image.ubuntu.com)
--revision= Select revision
--use-raw-disk Use raw disks instead of qcow2
output from ubuntu-emulator
ubuntu-emulator:
Installerad: 0.2+14.04.20140416.2-0ubuntu1
Kandidat: 0.2+14.04.20140416.2-0ubuntu1
Versionstabell:
*** 0.2+14.04.20140416.2-0ubuntu1 0
500 http://se.archive.ubuntu.com/ubuntu/ trusty/universe amd64
Packages
100 /var/lib/dpkg/status