package fontconfig-config 2.13.1-4.4ubuntu1 failed to install/upgrade: trying to overwrite '/etc/fonts/conf.d/10-sub-pixel-rgb.conf', which is also in package kubuntu-settings-desktop 1:23.04.2

[Am fermas]

 I don't know

ProblemType: Package
DistroRelease: Ubuntu 23.04
Package: fontconfig-config 2.13.1-4.4ubuntu1
ProcVersionSignature: Ubuntu 5.19.0-21.21-generic 5.19.7
Uname: Linux 5.19.0-21-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.24.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
Date: Sat Feb 4 05:59:53 2023
DuplicateSignature:
 package:fontconfig-config:2.13.1-4.4ubuntu1
 Unpacking fontconfig-config (2.14.1-3ubuntu1) over (2.13.1-4.4ubuntu1) ...
 dpkg: error processing archive /tmp/apt-dpkg-install-xn7IM4/015-fontconfig-config_2.14.1-3ubuntu1_amd64.deb (--unpack):
  trying to overwrite '/etc/fonts/conf.d/10-sub-pixel-rgb.conf', which is also in package kubuntu-settings-desktop 1:23.04.2
ErrorMessage: trying to overwrite '/etc/fonts/conf.d/10-sub-pixel-rgb.conf', which is also in package kubuntu-settings-desktop 1:23.04.2
InstallationDate: Installed on 2023-01-31 (3 days ago)
InstallationMedia: Kubuntu 23.04 "Lunar Lobster" - Alpha amd64 (20230130)
PackageArchitecture: all
Python3Details: /usr/bin/python3.11, Python 3.11.1, python3-minimal, 3.11.1-0ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.21.19ubuntu3
 apt 2.5.5
SourcePackage: fontconfig
Title: package fontconfig-config 2.13.1-4.4ubuntu1 failed to install/upgrade: trying to overwrite '/etc/fonts/conf.d/10-sub-pixel-rgb.conf', which is also in package kubuntu-settings-desktop 1:23.04.2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gunnar Hjalmarsson (gunnarhj)]

Upstream enabled 10-sub-pixel-rgb.conf by default.

It should be mentioned that the change resulted in a discussion, and there is a later upstream commit which makes a choice of 10-sub-pixel-*.conf configurable instead. But assuming that we want to keep "rgb" as the default in standard Ubuntu, I won't change fontconfig for now.

Instead I have uploaded a change to kubuntu-desktop which stops installing /etc/fonts/conf.d/10-sub-pixel-rgb.conf.

Btw, Debian's fix of the similar linked fontconfig bug does not apply to us, since we don't provide debconf prompts.

[Launchpad Janitor (janitor)]

This bug was fixed in the package kubuntu-settings - 1:23.04.3

---------------
kubuntu-settings (1:23.04.3) lunar; urgency=medium

  [ Rik Mills ]
  * Update Kubuntu theme.

  [ Gunnar Hjalmarsson ]
  * debian/kubuntu-settings-desktop.links:
    - Drop etc/fonts/conf.d/10-sub-pixel-rgb.conf, since that link is
      now installed by fontconfig (LP: #2005124).

 -- Gunnar Hjalmarsson <email address hidden> Sat, 04 Feb 2023 18:37:42 +0100

[Gunnar Hjalmarsson (gunnarhj)]

It struck me that this issue motivates a Breaks/Replaces in fontconfig-config to ensure smooth upgrades. I uploaded that change.

[Andreas Berger (hatbollen)]

Is there any way to work around this until a fix is released?
It appears I cannot use apt to upgrade/remove other things while this is broken.

[Derk Willem te Bokkel (dtebokkel)]

yes in a terminal app..

sudo dpkg -r kubuntu-desktop
sudo dpkg -r kubuntu-settings-desktop
sudo apt --fix-broken install
sudo apt reinstall kubuntu-desktop

will get around the blockage (as kubuntu-settings-desktop gets pulled in by kubuntu-desktop both need to be temporarily removed)

[Andreas Berger (hatbollen)]

Very cool, thanks for that!

[Launchpad Janitor (janitor)]

This bug was fixed in the package fontconfig - 2.14.1-3ubuntu3

---------------
fontconfig (2.14.1-3ubuntu3) lunar; urgency=medium

  * Implement the transition of available config files from /etc to
    /usr after a decade of delay (LP: #2007124).

fontconfig (2.14.1-3ubuntu2) lunar; urgency=medium

  * debian/control:
    - Make fontconfig-config break/replace kubuntu-settings-desktop
      << 1:23.04.3 to handle symlink conflict (LP: #2005124).

 -- Gunnar Hjalmarsson <email address hidden> Thu, 23 Feb 2023 15:54:28 +0100