** Changed in: unattended-upgrades (Ubuntu)
       Status: Opinion => In Progress

** Changed in: unattended-upgrades (Ubuntu Artful)
       Status: Opinion => In Progress

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https://bugs.launchpad.net/bugs/1624644

Title:
  By default settings unattended-upgrade does not automatically remove
  packages that become unused in conjunction with updating by other
  software

Status in apt package in Ubuntu:
  Confirmed
Status in gnome-software package in Ubuntu:
  Invalid
Status in unattended-upgrades package in Ubuntu:
  In Progress
Status in update-manager package in Ubuntu:
  In Progress
Status in apt source package in Artful:
  Confirmed
Status in gnome-software source package in Artful:
  Invalid
Status in unattended-upgrades source package in Artful:
  In Progress
Status in update-manager source package in Artful:
  In Progress

Bug description:
  When using default settings for unattended-upgrade i.e.
  Unattended-Upgrade::Remove-Unused-Dependencies "false";
  # default "false"
  Unattended-Upgrade::Remove-New-Unused-Dependencies "true";
  # default "true"
  in configuration file /etc/apt/apt.conf.d/50unattended-upgrades,
  unattended-upgrade is unable to remove packages that become unused in 
conjunction with updating by other software such as update-manager or apt 
full-upgrade. This is because unattended-upgrade compares the list of unneeded 
packages before and after it upgrades packages to detect which packages are new 
unused ones.

  Consequently, if user installs new kernels using e.g. update-manager,
  the excessive kernels will not be removed by unattended-upgrade, and
  eventually (small) /boot will become full.

  Expected behavior: handle removing of unused packages differently at
  least until other package management software installed by default can
  handle removing of new unused packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unattended-upgrades 0.90
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic i686
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  CurrentDesktop: XFCE
  Date: Sat Sep 17 11:28:44 2016
  InstallationDate: Installed on 2016-09-05 (11 days ago)
  InstallationMedia: Mythbuntu 16.04.1 LTS "Xenial Xerus" - Release i386 
(20160719)
  PackageArchitecture: all
  SourcePackage: unattended-upgrades
  UpgradeStatus: No upgrade log present (probably fresh install)

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