Re-closing the yakkety task since this does work on yakkety.

For those trying to test on xenial, you'll need to wait for casper
1.376.2, still in the unapproved queue. xenial doesn't have security
updates every day so testing the latest daily image often will not
trigger this bug overnight.

** Changed in: casper (Ubuntu Yakkety)
       Status: Triaged => Fix Released

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Matching subscriptions: Ubuntu 16.04 Bugs

  Unattended upgrades can break persistent live media

Status in casper package in Ubuntu:
  Fix Released
Status in casper source package in Xenial:
  Fix Committed
Status in casper source package in Yakkety:
  Fix Released

Bug description:
  Test Case
  1) Boot an Ubuntu 16.04 Live CD
  2) Choose Try Ubuntu
  3) head -n5 /etc/apt/apt.conf.d/50unattended-upgrades
  4) Observe -security is enabled in line 3.  (// is a comment)
  5) Run /usr/lib/apt/apt.systemd.daily
  6) Observe your Live environment run out of space! (I received a pop-up re 
lack of free space and 
/var/log/unattended-upgrades/unattended-upgrades-dpkg.log contained an error 
installing a package due to disk full.)

  With the version of the package in -proposed step 4 will reveal the
  -security pocket being disabled and step 6 won't fill your live

  Regression Potential
  Persistent live users will not receive updates from -security, but that seems 
less bad than destroying people's live environment by filling up their disk.

  Original Bug Description
  Looking at the persistent live Ubuntu 16.04 LTS system - the Software & 
Updates screen / Update - I notice, that Automatic updates is set to 'Download 
and install automatically'. This is bad in a persistent live system.

  After leaving the persistent live Ubuntu 16.04 LTS system running
  overnight, I found that it had performed an automatic upgrade:

  df revealed that the content in casper-rw had increased to 1.6 GiB.

  It was a surprise that the persistent live system started an automatic
  upgrade. This is not caused by the installer (mkusb), because the
  files controlling those actions are not touched. Instead it is caused
  by a change of the default action, when there are security updates.
  And the survey indicates that this default setting is different
  between the flavours and versions of Ubuntu. Lubuntu keeps the setting
  'Display immediately', while the other tested flavours change it from
  14.04 LTS to 16.04 LTS.

  Until this is resolved, it is a good idea to disable unattended-
  upgrades manually, but above all, to take regular backups, when you
  use a persistent live system.

  The survey is described in this link to the Ubuntu Forums:

  and it contains some screenshots illustrating the settings manager for
  automatic updates for different versions and flavours of Ubuntu.


  There are various scripts in the casper package that change things to
  be more appropriate for the live environment. I suggest to change the
  default for security updates to 'Display immediately', when the system
  is running live and persistent live.

  See also this link to Ask Ubuntu, the first report about this problem:


  Addendum: Things should continue to work if you leave a live Ubuntu
  iso running for a day or two. Unattended upgrades cause problems for
  all live systems, 'live-only' and 'persistent live'.

  ProblemType: BugDistroRelease: Ubuntu 16.04
  Package: casper 1.376
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CasperVersion: 1.376
  CurrentDesktop: Unity
  Date: Thu Sep  1 08:32:08 2016
  LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
   PATH=(custom, no user)
   SHELL=/bin/bashSourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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