[Bug 1891515] Re: ucf overwrites diverted configuration file breaking unattended upgrades - upstream fix available

[Steve Langasek]

*** This bug is a duplicate of bug 1891110 ***
    https://bugs.launchpad.net/bugs/1891110

** Changed in: dovecot (Ubuntu)
       Status: New => Invalid

** This bug has been marked a duplicate of bug 1891110
   Focal ucf need redirect fixes backported to ensure working with config-package-dev

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https://bugs.launchpad.net/bugs/1891515

Title:
  ucf overwrites diverted configuration file breaking unattended
  upgrades - upstream fix available

Status in ucf:
  Unknown
Status in dovecot package in Ubuntu:
  Invalid
Status in ucf package in Ubuntu:
  New

Bug description:
  An unattended security upgrade (package dovecot-core) failed,
  interrupting mailbox service. The cause was ucf replacing a custom
  configuration file which had been diverted (using dpkg-divert) by a
  custom configuration package.

  Excerpt from /var/log/apt/term.log:
  ---
  Setting up dovecot-core (1:2.2.33.2-1ubuntu4.6) ...
  Replacing config file /etc/dovecot/dovecot.conf.custom with new version
  ucfr: Attempt from package dovecot-core  to take /etc/dovecot/dovecot.conf.custom away from package custom-mail-server
  ucfr: Aborting.
  dpkg: error processing package dovecot-core (--configure):
   installed dovecot-core package post-installation script subprocess returned error exit status 4
  ---

  The underlying issue has been fixed upstream in ucf version 3.0040:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=477773

  Affected versions:
  - Ubuntu 18.04.5 LTS - ucf 3.0038
  - Ubuntu 20.04.1 LTS - ucf 3.0038+nmu1

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