$ sudo unity8-lxc-setup --rebuild-all --redownload
[sudo] password for alan: 
#################### 100.0% 0.0 kBps DONE    

reading seed file /var/lib/lxc/unity8-lxc/ubuntu-next.iso: *************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read /var/lib/lxc/unity8-lxc/ubuntu-next.iso. Target 100.0% complete.      **************************
verifying download...checksum matches OK
used 1086259200 local, fetched 0
Unpacking the ISO image...
Configuring the Unity8 LXC...
dget: retrieving http://archive.ubuntu.com/ubuntu/pool/main/u/upstart/upstart-sysv_1.13.2-0ubuntu14_amd64.deb
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 40290  100 40290    0     0   427k      0 --:--:-- --:--:-- --:--:--  432k
Starting the container
Switching to upstart...
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED
  systemd-sysv ubuntu-standard
The following NEW packages will be installed
  upstart-sysv
0 to upgrade, 1 to newly install, 2 to remove and 0 not to upgrade.
Need to get 0 B/40.3 kB of archives.
After this operation, 56.3 kB of additional disk space will be used.
(Reading database ... 125304 files and directories currently installed.)
Removing ubuntu-standard (1.334) ...
dpkg: systemd-sysv: dependency problems, but removing anyway as you requested:
 init depends on systemd-sysv | upstart-sysv; however:
  Package systemd-sysv is to be removed.
  Package upstart-sysv is not installed.

Removing systemd-sysv (219-10ubuntu1) ...
Processing triggers for man-db (2.7.0.2-5) ...
Selecting previously unselected package upstart-sysv.
(Reading database ... 125284 files and directories currently installed.)
Preparing to unpack .../upstart-sysv_1.13.2-0ubuntu14_amd64.deb ...
Unpacking upstart-sysv (1.13.2-0ubuntu14) ...
Processing triggers for man-db (2.7.0.2-5) ...
Setting up upstart-sysv (1.13.2-0ubuntu14) ...