I've build a custom debian package with shuold overwrite configs of lightdm (autologin). My install script (debian/install) contains the following lines:

lightdm/* /etc/lightdm/lightdm.conf.d/

But I get the following error while installing my custom package:

dpkg: error processing /var/cache/apt/archives/AAA (--unpack):
trying to overwrite `/etc/lightdm/lightdm.conf.d/20-lubuntu.conf', which is also in package CCC
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
AAA E: Sub-process /usr/bin/dpkg returned an error code (1)

I know i can use the param --force-overwrite to install the package via dpkg. But I want to install it as dependency of an other package. So how can I allow my package to overwrite the config files of other packages?

I tried this but it wont work (debian/rules):

#!/usr/bin/make -f

   dh $@

   dh_command -- --force-overwrite

   dh_installdeb -- --force-overwrite

I got it. There is only on thing left. Now i can divert the original conf file. But the checksums of my DEBIAN/conffile is invalid so I deleted it. My debian/rules file:

overrider dh_installdeb:
    rm debian/mypackage-name/DEBIAN/conffiles

I get the follwing warning:

Configuration file `/etc/lightdm/lightdm.conf.d/20-ubuntu.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** bash.bashrc (Y/I/N/O/D/Z) [default=N] ?

How can I remove the warning message?

This is the content of my debian/preinst file:

dpkg-divert --add --package mypackage-name --rename --divert /etc/lightdm/lightdm.conf.d/20-lubuntu.conf.real /etc/lightdm/lightdm.conf.d/20-lubuntu.conf

Content of my debian/install file:

lightdm/* /etc/lightdm/lightdm.conf.d/

Content debian/rules:

#!/usr/bin/make -f

    dh $@

    dh_builddeb -- -z1

overrider dh_installdeb:
    rm debian/mypackage-name/DEBIAN/conffiles


  • Anything that's in debian/rules is for building the package only, not for installing the package. – saiarcot895 Feb 15 '15 at 21:34

You don't. You divert them instead. For convenience, what I do is use a helper package like config-package-dev. With config-package-dev, you give your configuration files some specific names, and the installation will automatically do the required diversion.

For example, if your package is named foo-bar, then:

  1. Your debian/rules will have:

        dh $@ --with config-package
  2. Your configuration files end with .foo (for example, lightdm/20-lubuntu.conf.foo is created by your package building process) - the first word of your package name is used for this extension.
  3. You have config-package-dev in as a Build-Depends in your debian/control. For example:

    Build-Depends: debhelper (>= 7.0.0~), config-package-dev (>= 5.0)

    This means that config-package-dev needs to be installed before you try to build the package, but not for installing.

  4. In addition to the debian/install file, create a displace file listing each file which needs to be diverted. For example, it would contain:

| improve this answer | |
  • @IHopeLinux I think you missed the warning. – muru Feb 17 '15 at 21:19
  • Ive postet you the message in another answer – IHopeLinux Feb 17 '15 at 22:20
  • @IHopeLinux Edit it into the question, please. Also, does any of your scripts modify that file? Or has it been modified by other means? – muru Feb 17 '15 at 22:21
  • Its now in the first post. Sorry :) No i am only replacing the original file. But it wont wurk because the conffile-checksums are diferent. I read here i have to remove the DEBIAN/conffile, but now i get this error messige. – IHopeLinux Feb 18 '15 at 13:05

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