Docker appliance fails to start

Running boot2docker and docker v1.7.0 I get the following error:

```
$ docker run -p 8010:80 -p 9009:9009 -v `pwd`:/opt/galaxy/tools -i -t planemo/interactive
umount: /var/lib/docker: must be superuser to umount
Removing user `ubuntu' ...
Warning: group `ubuntu' has no more members.
Done.
groupadd: GID '50' already exists
useradd: group 'ubuntu' does not exist
chown: cannot access '/tmp/slurm': No such file or directory
tmpfs on /proc/kcore type tmpfs (rw,nosuid,mode=755)
Disable Galaxy Interactive Environments. Start with --privileged to enable IE's.
/usr/lib/python2.7/dist-packages/supervisor/options.py:295: UserWarning: Supervisord is running as root and it is searching for its configuration file in default locations (including its current working directory); you probably want to specify a "-c" argument specifying an absolute path to a configuration file for improved security.
'Supervisord is running as root and it is searching '
Error: Invalid user name ubuntu
For help, use /usr/bin/supervisord -h
Starting nodejs
unix:///var/run/supervisor.sock no such file
No passwd entry for user 'ubuntu'
```