Hello Ernst, or anyone else affected,

Accepted unattended-upgrades into bionic-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/unattended-upgrades/1.1ubuntu1.18.04.3 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unattended-upgrades in

  checking trust of archives eats a lot of cpu

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Fix Committed

Bug description:

   * Unattended-upgrades consumes tens of seconds or even minutes of CPU
  time to verify the origin of the packages

   * Using excessive amount of CPU is unpleasant for desktop/laptop
  users and also wastes computation time on servers/cloud instances.

   * Unattended-upgrades' algorithm for checking and adjusting package
  origins is redesigned to visit and adjust less packages.

  [Test Case]

   * The added upgrade-all-security autopkgtest measure the time u-u needs for 
upgrading security updates on the tested release starting with no security 
updates applied to the point where all security updates are applied but all 
packages are left upgradable from <release>-updates. The test also measures the 
time needed for --dry-run to find no updates to be installed unattended.
  * Please run autopkgtests and look for the to time results:
  All upgrades installed
  44.41user 3.06system 0:48.35elapsed 98%CPU (0avgtext+0avgdata 
  208inputs+192376outputs (0major+642657minor)pagefaults 0swaps
  No packages found that can be upgraded unattended and no pending auto-removals
  2.83user 0.11system 0:02.98elapsed 98%CPU (0avgtext+0avgdata 

  [Regression Potential] 

   * Due to algorithm redesign there is a risk that packages from
  allowed origins are not upgraded. There were unit tests for testing
  the selection of the right packages to upgrade already, but a new
  autopkgtest is also introduce to verify u-u's behavior on current
  real-life security-updates.

  [Original bug text]

  (System: Ubuntu 14.04, up to date packages)

  I noticed that unattended-upgrades spends a significant amount of time
  in phases where it runs at 100% cpu. On a slower machine (core 2 t7200
  2GHz) this goes on for minutes rather than seconds. This interferes
  with using the machine for other tasks.

  Using the --debug option to unattended-upgrades shows that the program
  outputs a lot of lines like the following during these 100% cpu

  matching 'a'='trusty-updates' against '<Origin component:'universe'
  archive:'trusty-updates' origin:'Ubuntu' label:'Ubuntu'
  site:'de.archive.ubuntu.com' isTrusted:True>

  From this output I guess the operation executed is not so complicated
  that it should require so much cpu power. ??

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unattended-upgrades 0.82.1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  Date: Wed Nov 26 21:53:57 2014
  InstallationDate: Installed on 2014-08-28 (90 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 
  PackageArchitecture: all
   PATH=(custom, no user)
  SourcePackage: unattended-upgrades
  UpgradeStatus: No upgrade log present (probably fresh install)

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