[Bug 1891110] Re: Focal ucf need redirect fixes backported to ensure working with config-package-dev

[Stephen Fletcher]

[Impact]

 * Cannot use ucf to install templated configuration when using 
    dpkg-divert with the destination config file

 * Affects various packages including dovecot and any custom config
   packages using both config-package-dev and ucf

[Test Plan]

 * Create a config-package-dev based config-packagename.deb to replace existsing config
 
 * Include a line in the postinst in the config.deb to install a template 
   for a  config file also spcified in the displace file (which is therefore 
   diverted by dpkg-divert)

[Where problems could occur]

 * Any issue with patch may cause issues with packages installing config via ucf
   (this includes dovecot, openssh-server, php7.4, gdm3) 

[Other Info]
 
 * Tested with config-package-dev rolled config deb package

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https://bugs.launchpad.net/bugs/1891110

Title:
  Focal ucf need redirect fixes backported to ensure working with
  config-package-dev

Status in ucf package in Ubuntu:
  Fix Released
Status in ucf source package in Focal:
  Incomplete
Status in ucf package in Debian:
  Fix Released

Bug description:
  When using config-package-dev and diverting config files for packages
  that use ucf to manage installation of their config files, this patch
  is necessary to ensure config files are correctly diverted.

  Please apply to upstream Focal UCF package

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