Hello Balint, or anyone else affected,

Accepted unattended-upgrades into cosmic-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/unattended-upgrades/1.5ubuntu3.18.10.4 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-cosmic to verification-done-cosmic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-cosmic. 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
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: unattended-upgrades (Ubuntu Cosmic)
       Status: New => Fix Committed

** Tags added: verification-needed-cosmic

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unattended-upgrades in
Ubuntu.
https://bugs.launchpad.net/bugs/1824804

Title:
  Unattended upgrades falls back to adjust all upgradable packages in
  attempt to install held packages

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

Bug description:
  [Impact]

   * The fix for LP: #1821101 allowed installing packages for which
  APT's resolver could not find solution for without adjusting other
  packages, but also tries to adjust many packages to install packages
  which are held back.

  [Test Case]

   * Set up a system where systemd (or a package that can't be upgraded
  without also upgrading other packages) need to be upgraded to the
  version in -security.

   * Mark systemd on hold
     apt mark hold systemd

   * Observe u-u falling back to adjusting all upgradable packages in
  unfixed versions and adjusting only a few in fixed versions:

  # unattended-upgrade --verbose --debug
  ...

  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  falling back to marking libnss-systemd, then adjusting changes
  package libnss-systemd upgradable but fails to be marked for upgrade 
(E:Unable to correct problems, you have held broken packages.)
  falling back to adjusting all packages
  adjusting candidate version: 2ping=4.1-1
  ...

    Fixed:
  ...
  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  falling back to adjusting libnss-systemd's dependencies recursively
  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  adjusting candidate version: libkmod2=24-1ubuntu3
  adjusting candidate version: mount=2.31.1-0.4ubuntu3
  adjusting candidate version: libmount1=2.31.1-0.4ubuntu3
  ...

  [Regression Potential]

   * The less extensive fallback may not find solutions for installing
  packages with special relationships that the full fallback could have
  found, but I don't know about such special cases in the archive and
  the autopkgtest cover a fair set of popular packages. Keeping back
  those packages seems to be better than spending a lot of CPU time on
  finding a few solutions - which still was not enough to find _all_
  solutions.

  
  [Other Info]

  Originally reported at: https://bugs.launchpad.net/ubuntu/+source
  /unattended-upgrades/+bug/1396787/comments/21

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