$ sudo unity8-lxc-setup
#################### 100.0% 383.0 kBps DONE     

open: No such file or directory
not using seed file /var/lib/lxc/unity8-lxc/ubuntu-next.iso
Read /var/lib/lxc/unity8-lxc/ubuntu-next.iso. Target 0.0% complete.      
No relevent local data found - I will be downloading the whole file. If that's not what you want, CTRL-C out. You should specify the local file is the old version of the file to download with -i (you might have to decompress it with gzip -d first). Or perhaps you just have no data that helps download the file
downloading from http://cdimage.ubuntu.com/ubuntu-desktop-next/daily-live/current/wily-desktop-amd64.iso:
-------------------- 0.0% 8.6 kBps         
-------------------- 2.9% 8.2 kBps         ETA   
#------------------- 6.0% 9.6 kBps         ETA   
#################### 100.0% 2279.5 kBps DONE      

verifying download...checksum matches OK
used 0 local, fetched 1086259544
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   101k      0 --:--:-- --:--:-- --:--:--  101k
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 upgraded, 1 newly installed, 2 to remove and 0 not upgraded.
Need to get 40.3 kB of archives.
After this operation, 56.3 kB of additional disk space will be used.
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?