Comment 1 for bug 1632130

@Olivier

I'm trying to reproduce this issue, but it looks everything works fine.
I can 'snap download' or 'snap refresh' snaps, like ubuntu-core or nextcloud on my nextcloud box.

Here is my steps:
1. install the server image we released ubuntu-standard-16.04-server-armhf-raspberry-pi-installer-20160825.img
2. upgrade the system to the latest by 'sudo apt dist-upgrade'
3. reboot
4. refresh/download snaps.

ubuntu@ubuntu-standard:~$ dpkg -l | grep snap
ii snap-confine 1.0.43-0ubuntu1~16.04.1 armhf Support executable to apply confinement for snappy apps
ii snapd 2.15.2ubuntu1 armhf Tool to interact with Ubuntu Core Snappy.
ii ubuntu-core-launcher 1.0.43-0ubuntu1~16.04.1 armhf Launcher for ubuntu-core (snappy) apps
ubuntu@ubuntu-standard:~$ snap list
Name Version Rev Developer Notes
nextcloud 9.0.53snap2 48 nextcloud -
ubuntu-core 16.04+20160531.12-01 120 canonical -
ubuntu@ubuntu-standard:~$ sudo snap download ubuntu-core
[sudo] password for ubuntu:
Fetching snap "ubuntu-core"
55.77 MB / 55.77 MB [=============================================================================================================================] 100.00 % 1.90 MB/s
Fetching assertions for "ubuntu-core"
ubuntu@ubuntu-standard:~$ sudo snap refresh ubuntu-core
55.77 MB / 55.77 MB [===========================================================================================================================] 100.00 % 789.45 KB/s

ubuntu-core (stable) 16.04.1 from 'canonical' upgraded
ubuntu@ubuntu-standard:~$ sudo snap refresh nextcloud
127.24 MB / 127.24 MB [=======================================================================================================================>_] 100.00 % 674.35 KB/s

nextcloud (stable) 9.0.53snap4 from 'nextcloud' upgraded
ubuntu@ubuntu-standard:~$ sudo snap download nextcloud
Fetching snap "nextcloud"
127.24 MB / 127.24 MB [===========================================================================================================================] 100.00 % 1.92 MB/s
Fetching assertions for "nextcloud"
ubuntu@ubuntu-standard:~$ snap list
Name Version Rev Developer Notes
nextcloud 9.0.53snap4 99 nextcloud -
ubuntu-core 16.04.1 424 canonical -

Download and refresh work fine, could you give me more detail steps to reproduce this issue?
and could you also try to upgrade ubuntu-core-launcher first if it's not the latest one and see if this issue still can be reproduced?