[Bug 1619188] Re: Unattended upgrades can break persistent live media

[Alberto Salvia Novella]

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Title:
  Unattended upgrades can break persistent live media

Status in casper package in Ubuntu:
  Confirmed

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:

  https://ubuntuforums.org/showthread.php?t=2335669&p=13538805#post13538805

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

  -o-

  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:

  https://askubuntu.com/questions/817750/unattended-upgrades-broke-
  persistent-live-media/817820#

  -o-

  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: Bug
  DistroRelease: 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)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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