ubuntu@localhost:~$ snappy list
Usage:snappy [-h] [-v]
             {info,versions,search,update-versions,update,rollback,install,uninstall,tags,config,build,booted,chroot,framework,fake-version,nap}
             ...
snappy: error: invalid choice: 'list' (choose from 'info', 'versions', 'search', 'update-versions', 'update', 'rollback', 'install', 'uninstall', 'tags', 'config', 'build', 'booted', 'chroot', 'framework', 'fake-version', 'nap')