squid-reverseproxy fails on install

Running on MaaS. juju 1.20.12-trusty-amd64, cs:trusty/squid-reverseproxy-0 REV 50

johan@maas:~$ juju deploy --to lxc:1 squid-reverseproxy

johan@maas:~$ juju status squid-reverseproxy
environment: maas
machines:
  "1":
    agent-state: started
    agent-version: 1.20.12
    dns-name: aebjn.maas.molnix.com
    instance-id: /MAAS/api/1.0/nodes/node-ad21f0d4-6ffc-11e4-865c-0021702cb7de/
    series: trusty
    containers:
      1/lxc/8:
        agent-state: started
        agent-version: 1.20.12
        dns-name: 192.168.0.151
        instance-id: juju-machine-1-lxc-8
        series: trusty
        hardware: arch=amd64
    hardware: arch=amd64 cpu-cores=2 mem=6144M
services:
  squid-reverseproxy:
    charm: cs:trusty/squid-reverseproxy-0
    exposed: false
    units:
      squid-reverseproxy/0:
        agent-state: error
        agent-state-info: 'hook failed: "install"'
        agent-version: 1.20.12
        machine: 1/lxc/8
        public-address: 192.168.0.151

johan@maas:~$ juju ssh squid-reverseproxy/0 tail /var/log/juju/unit-squid-reverseproxy-0.log
2014-11-27 13:07:59 INFO juju.worker runner.go:260 start "uniter"
2014-11-27 13:07:59 DEBUG juju.worker.logger logger.go:60 logger setup
2014-11-27 13:07:59 INFO juju.worker runner.go:260 start "apiaddressupdater"
2014-11-27 13:07:59 INFO juju.worker runner.go:260 start "rsyslog"
2014-11-27 13:07:59 DEBUG juju.worker.rsyslog worker.go:75 starting rsyslog worker mode 1 for "unit-squid-reverseproxy-0" ""
2014-11-27 13:07:59 INFO juju.worker.apiaddressupdater apiaddressupdater.go:61 API addresses updated to [["public:dygmj.maas.molnix.com" "local-cloud:dygmj.maas.molnix.com" "local-cloud:192.168.0.101" "local-machine:127.0.0.1" "local-machine:::1" "fe80::224:e8ff:fe39:6a10"]]
2014-11-27 13:07:59 INFO juju.worker.upgrader upgrader.go:116 desired tool version: 1.20.12
2014-11-27 13:07:59 DEBUG juju.worker.logger logger.go:45 reconfiguring logging from "<root>=DEBUG" to "<root>=WARNING;unit=DEBUG"
2014-11-27 13:08:00 INFO juju-log Invoking charm-pre-install hooks
2014-11-27 13:08:00 ERROR juju.worker.uniter uniter.go:486 hook failed: exit status 1
Connection to 192.168.0.151 closed.