Comment 11 for bug 1508081

It happened this morning on arale. Download failed with a time out while other devices downloaded the update successfully at the same time and logs from my router do not show any networking issue

From system-image/client.log
[systemimage] Dec 01 05:00:11 2015 (10657) [/com/canonical/applications/download/e58d05ab667c4ffea31ec84a37b64947] Running group download reactor
[systemimage] Dec 01 05:10:20 2015 (10657) [/com/canonical/applications/download/e58d05ab667c4ffea31ec84a37b64947] Group download reactor done
[systemimage] Dec 01 05:10:20 2015 (10657) Download failed
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/systemimage/dbus.py", line 226, in _download
    self._api.download()
  File "/usr/lib/python3/dist-packages/systemimage/api.py", line 124, in download
    self._state.run_until('apply')
  File "/usr/lib/python3/dist-packages/systemimage/state.py", line 178, in run_until
    step()
  File "/usr/lib/python3/dist-packages/systemimage/state.py", line 506, in _download_files
    self.downloader.get_files(downloads, pausable=True)
  File "/usr/lib/python3/dist-packages/systemimage/download.py", line 203, in get_files
    self._get_files(records, pausable)
  File "/usr/lib/python3/dist-packages/systemimage/udm.py", line 169, in _get_files
    raise TimeoutError
TimeoutError

There is also this error in ubuntu-download-manager/ubuntu-download-manager.INFO before the update starts:
E1201 05:00:09.382732 10660 downloads_db.cpp:133] Could not create the data path /var/cache/ubuntu-download-manager
I1201 05:00:09.387313 10660 downloads_db.cpp:138] Db file is /var/cache/ubuntu-download-manager/downloads.db
E1201 05:00:09.387907 10660 downloads_db.cpp:147] out of memory Error opening database

I don't know if it is related because it is also present when the update is successful.