Hi *, On Sat, Jan 18, 2014 at 03:59:06PM -0800, Tom Epperly wrote: > # apt-get dist-upgrade -u > Reading package lists... Done > Building dependency tree > Reading state information... Done > Calculating upgrade... Failed > The following packages have unmet dependencies: > libnss-mdns : Breaks: lib32nss-mdns (< 0.10-6) but 0.10-3.2 is to be installed > E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. > E: Internal error, Upgrade broke stuff Thanks to the files Tom provided I was able to reproduce the problem and even found out why it didn't worked for me the few times before: I have Multi-Arch enabled on my system, Tom and supposedly other reporters also don't. The problem can be seen by running: apt-get dist-upgrade -s -o Debug::pkgDepCache::AutoInstall=1 -o Debug::pkgDepCache::Marker=1 -o Debug::pkgProblemResolver=1 It will print huge amounts of text, but what it says is basically: "lib32nss-mdns" depends on "libnss-mdns-i386" now, which is a i386-only package, so not available on a amd64 system. In the debug output you will find a line start with "MarkInstall lib32nss-mdns …" and the following line will end in "… can't be satisfied" confirming this. What the resolver tries now is to: 1. keep lib32nss-mdns at the version currently installed because it can't be upgraded AND at the same time: 2. upgrade it because libnss-mdns:amd64 requires it This can't work, but apt isn't understand that it can't work… The attached patch corrects this by recognizing in the previously mentioned MarkInstall that there is no point in trying to upgrade it as there is no possibility it could work: It will hence "forget" that it can upgrade this package. The resolver will later on find the correct solution to the problem as a result of that: Remove lib32nss-mdns. But you don't need to wait for this patch to be applied: If you are effected you have to decide if you need lib32 libraries (aka if you run any 32bit software on your 64bit system). If so, have a look at: https://wiki.debian.org/Multiarch/HOWTO Basically, it boils down to: dpkg --add-architecture i386 apt-get update APT will be able to do the right thing™ again and installs the i386 library for you (note that lib32nss-dns isn't removed in that case as now the dependency it has can be satisfied). If you don't need lib32 libs on the other hand apt-get purge '^lib32.*' '^ia32-.*' should be able to remove all these libraries. For the moment removing lib32nss-mdns is probably enough, but over time all other libraries will went through similar changes. Many already did for wheezy, so I am a bit surprised that this bug hasn't happend so far. Best regards David Kalnischkies
From 346b042ef1f290fcce0d2d90714061fb0972ec09 Mon Sep 17 00:00:00 2001
From: David Kalnischkies <david@kalnischkies.de>
Date: Thu, 6 Feb 2014 00:13:10 +0100
Subject: [PATCH] discard impossible candidates in MarkInstall
If a (Pre-)Depends can't be satisfied there is no point in keeping the
candidate as is as it is impossible to find a solution for it, so we can
just as well reset the candidate to the currently installed version.
We avoid trying to install this impossible candidate later on this way.
Closes: #735967
---
apt-pkg/depcache.cc | 9 ++-
.../test-bug-735967-lib32-to-i386-unavailable | 86 ++++++++++++++++++++++
2 files changed, 93 insertions(+), 2 deletions(-)
create mode 100755 test/integration/test-bug-735967-lib32-to-i386-unavailable
diff --git a/apt-pkg/depcache.cc b/apt-pkg/depcache.cc
index f9c891c..7e75a6f 100644
--- a/apt-pkg/depcache.cc
+++ b/apt-pkg/depcache.cc
@@ -1134,8 +1134,13 @@ bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
std::clog << OutputInDepth(Depth) << Start << " can't be satisfied!" << std::endl;
if (Start.IsCritical() == false)
continue;
- // if the dependency was critical, we can't install it, so remove it again
- MarkDelete(Pkg,false,Depth + 1, false);
+ // if the dependency was critical, we have absolutely no chance to install it,
+ // so if it wasn't installed remove it again. If it was, discard the candidate
+ // as the problemresolver will trip over it otherwise trying to install it (#735967)
+ if (Pkg->CurrentVer == 0)
+ MarkDelete(Pkg,false,Depth + 1, false);
+ else
+ SetCandidateVersion(Pkg.CurrentVer());
return false;
}
diff --git a/test/integration/test-bug-735967-lib32-to-i386-unavailable b/test/integration/test-bug-735967-lib32-to-i386-unavailable
new file mode 100755
index 0000000..4dbe1d2
--- /dev/null
+++ b/test/integration/test-bug-735967-lib32-to-i386-unavailable
@@ -0,0 +1,86 @@
+#!/bin/sh
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+configarchitecture 'i386' 'amd64'
+
+insertpackage 'unstable' 'lib32nss-mdns' 'amd64' '0.10-6' 'Depends: libnss-mdns-i386 (= 0.10-6)'
+insertpackage 'unstable' 'libnss-mdns' 'amd64,i386' '0.10-6' 'Multi-Arch: same
+Breaks: lib32nss-mdns (<< 0.10-6)'
+insertpackage 'unstable' 'libnss-mdns-i386' 'i386' '0.10-6' 'Multi-Arch: foreign
+Depends: libnss-mdns'
+
+insertpackage 'unstable' 'foo' 'amd64' '1' 'Depends: libfoo'
+insertpackage 'unstable' 'libfoo' 'amd64' '1' 'Depends: libfoo-bin'
+insertpackage 'unstable' 'libfoo-bin' 'i386' '0.10-6' 'Multi-Arch: foreign'
+
+insertinstalledpackage 'lib32nss-mdns' 'amd64' '0.9-1'
+insertinstalledpackage 'libnss-mdns' 'amd64' '0.9-1'
+
+insertinstalledpackage 'i-make-packages-important' 'all' '1' 'Depends: libnss-mdns'
+
+setupaptarchive --no-update
+
+# make libnss-mdns-i386 unavailable
+configarchitecture 'amd64'
+testsuccess aptget update
+
+testequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+ lib32nss-mdns
+The following packages will be upgraded:
+ libnss-mdns
+1 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
+Remv lib32nss-mdns [0.9-1]
+Inst libnss-mdns [0.9-1] (0.10-6 unstable [amd64])
+Conf libnss-mdns (0.10-6 unstable [amd64])' aptget dist-upgrade -s
+
+testequal 'Reading package lists...
+Building dependency tree...
+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:
+ foo : Depends: libfoo but it is not going to be installed
+E: Unable to correct problems, you have held broken packages.' aptget install foo -s
+
+# activate multiarch
+configarchitecture 'amd64' 'i386'
+testsuccess aptget update
+
+testequal 'Reading package lists...
+Building dependency tree...
+The following NEW packages will be installed:
+ libnss-mdns:i386 libnss-mdns-i386:i386
+The following packages will be upgraded:
+ lib32nss-mdns libnss-mdns
+2 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
+Inst lib32nss-mdns [0.9-1] (0.10-6 unstable [amd64]) []
+Inst libnss-mdns [0.9-1] (0.10-6 unstable [amd64]) []
+Inst libnss-mdns:i386 (0.10-6 unstable [i386]) []
+Inst libnss-mdns-i386:i386 (0.10-6 unstable [i386])
+Conf libnss-mdns:i386 (0.10-6 unstable [i386])
+Conf libnss-mdns (0.10-6 unstable [amd64])
+Conf libnss-mdns-i386:i386 (0.10-6 unstable [i386])
+Conf lib32nss-mdns (0.10-6 unstable [amd64])' aptget dist-upgrade -s
+
+testequal 'Reading package lists...
+Building dependency tree...
+The following extra packages will be installed:
+ libfoo libfoo-bin:i386
+The following NEW packages will be installed:
+ foo libfoo libfoo-bin:i386
+0 upgraded, 3 newly installed, 0 to remove and 2 not upgraded.
+Inst libfoo-bin:i386 (0.10-6 unstable [i386])
+Inst libfoo (1 unstable [amd64])
+Inst foo (1 unstable [amd64])
+Conf libfoo-bin:i386 (0.10-6 unstable [i386])
+Conf libfoo (1 unstable [amd64])
+Conf foo (1 unstable [amd64])' aptget install foo -s
--
1.9.rc1
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