Debian Bug report logs - #859900
apt sometimes fails to install dependencies when recommends conflict

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From: Andreas Beckmann <[email protected]>
To: Debian Bug Tracking System <[email protected]>
Subject: apt: fails to install parl-desktop-world with --install-recommends
Message-ID: <[email protected]>
Date: Sun, 09 Apr 2017 01:51:45 +0200
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Package: apt
Version: 1.4
Severity: serious
User: [email protected]
Usertags: piuparts
Control: affects -1 + parl-desktop-world parl-desktop-eu

Hi,

during a test with piuparts I noticed that parl-desktop-world could not
be tested with --install-recommends enabled.

This can be easily reproduced in a minimal chroot (where installing
Recommends is disabled by default) with

# apt-get install --install-recommends parl-desktop-world
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 parl-desktop-world : Depends: myspell-cs but it is not going to be installed
E: Unable to correct problems, you have held broken packages.


The relevant bits of the dependency chain seem to be:

Package: parl-desktop-world
Depends: icedove-l10n-cs, myspell-cs

Package: icedove-l10n-cs
Depends: thunderbird-l10n-cs

Package: thunderbird-l10n-cs
Recommends: hunspell-cs | myspell-cs-cz

Package: hunspell-cs
Conflicts: myspell-cs

Package: myspell-cs
Replaces: myspell-cs-cz
Provides: myspell-cs-cz
Conflicts: myspell-cs-cz


This command would succeed: 
# apt-get install parl-desktop-world

and this sequence would work as well:
# apt-get install myspell-cs
# apt-get install --install-recommends parl-desktop-world


I must admit that the dependencies in parl-desktop-world should be
updated, but nevertheless apt should be able to install it in its
current state.


piuparts logs if you are interested:
https://piuparts.debian.org/stretch-rcmd/fail/parl-desktop-eu_1.9.9.log
https://piuparts.debian.org/stretch-rcmd/fail/parl-desktop-world_1.9.9.log


Andreas

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