Public bug reported:

The system image updates have been failing for me for a few days; I just
got a chance to look at it over adb shell, and am getting a python
backtrace:

# system-image-dbus -v
[systemimage] Sep 19 20:34:18 2013 (26752) SystemImage dbus main loop started 
[daily/mako]
[systemimage] Sep 19 20:34:25 2013 (26752) Looking for blacklist: 
https://system-image.ubuntu.com/gpg/blacklist.tar.xz
[systemimage] Sep 19 20:34:25 2013 (26752) downloading 
https://system-image.ubuntu.com/gpg/blacklist.tar.xz -> 
/tmp/system-image/keyring.tar.xz
[systemimage] Sep 19 20:34:25 2013 (26752) downloading 
https://system-image.ubuntu.com/gpg/blacklist.tar.xz.asc -> 
/tmp/system-image/keyring.tar.xz.asc
[systemimage] Sep 19 20:34:26 2013 (26752) Local blacklist file: 
/tmp/system-image/blacklist.tar.xz
[systemimage] Sep 19 20:34:26 2013 (26752) Looking for: 
https://system-image.ubuntu.com/channels.json
[systemimage] Sep 19 20:34:26 2013 (26752) downloading 
https://system-image.ubuntu.com/channels.json -> /tmp/system-image/channels.json
[systemimage] Sep 19 20:34:26 2013 (26752) downloading 
https://system-image.ubuntu.com/channels.json.asc -> 
/tmp/system-image/channels.json.asc
[systemimage] Sep 19 20:34:28 2013 (26752) Local channels file: 
/tmp/system-image/channels.json
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 634, in 
<lambda>
    return (lambda data: callback(*data), user_data)
  File "/usr/lib/python3/dist-packages/systemimage/dbus.py", line 45, in 
_check_for_update
    self._update = self._api.check_for_update()
  File "/usr/lib/python3/dist-packages/systemimage/api.py", line 96, in 
check_for_update
    self._state.run_until('download_files')
  File "/usr/lib/python3/dist-packages/systemimage/state.py", line 151, in 
run_until
    step()
  File "/usr/lib/python3/dist-packages/systemimage/state.py", line 255, in 
_get_channel
    self.channels = Channels.from_json(fp.read())
  File "/usr/lib/python3/dist-packages/systemimage/channel.py", line 40, in 
from_json
    keyring = detail_mapping.pop('keyring', None)
AttributeError: 'str' object has no attribute 'pop'

** Affects: system-image (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1227874

Title:
  system updates failing from /etc/ubuntu-build=4

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