Erro ao atualizar o mailman

Question

Recebi esta mensagem de erro hoje fazendo apt-get upgrade

Setting up mailman (1:2.1.16-2ubuntu0.1) ...
Looking for enabled languages (this may take some time) ... done.
Removing unmodified files from /etc/mailman/eu  done.
Directory /etc/mailman/eu not empty, not removed.
Removing unmodified files from /etc/mailman/no  done.
Directory /etc/mailman/no not empty, not removed.
Removing unmodified files from /etc/mailman/he  done.
Directory /etc/mailman/he not empty, not removed.
Removing unmodified files from /etc/mailman/tr  done.
Directory /etc/mailman/tr not empty, not removed.
Removing unmodified files from /etc/mailman/pt_BR  done.
Directory /etc/mailman/pt_BR not empty, not removed.
Removing unmodified files from /etc/mailman/lt  done.
Directory /etc/mailman/lt not empty, not removed.
Removing unmodified files from /etc/mailman/sk  done.
Directory /etc/mailman/sk not empty, not removed.
Removing unmodified files from /etc/mailman/nl  done.
Directory /etc/mailman/nl not empty, not removed.
Removing unmodified files from /etc/mailman/et  done.
Directory /etc/mailman/et not empty, not removed.
Removing unmodified files from /etc/mailman/hr  done.
Directory /etc/mailman/hr not empty, not removed.
Removing unmodified files from /etc/mailman/de  done.
Directory /etc/mailman/de not empty, not removed.
Removing unmodified files from /etc/mailman/it  done.
Directory /etc/mailman/it not empty, not removed.
Removing unmodified files from /etc/mailman/zh_CN  done.
Directory /etc/mailman/zh_CN not empty, not removed.
Removing unmodified files from /etc/mailman/fr  done.
Directory /etc/mailman/fr not empty, not removed.
Removing unmodified files from /etc/mailman/sr  done.
Directory /etc/mailman/sr not empty, not removed.
Removing unmodified files from /etc/mailman/zh_TW  done.
Directory /etc/mailman/zh_TW not empty, not removed.
Removing unmodified files from /etc/mailman/ru  done.
Directory /etc/mailman/ru not empty, not removed.
Removing unmodified files from /etc/mailman/ja  done.
Directory /etc/mailman/ja not empty, not removed.
Removing unmodified files from /etc/mailman/cs  done.
Directory /etc/mailman/cs not empty, not removed.
Removing unmodified files from /etc/mailman/fi  done.
Directory /etc/mailman/fi not empty, not removed.
Removing unmodified files from /etc/mailman/el  done.
Directory /etc/mailman/el not empty, not removed.
Removing unmodified files from /etc/mailman/ca  done.
Directory /etc/mailman/ca not empty, not removed.
Removing unmodified files from /etc/mailman/ar  done.
Directory /etc/mailman/ar not empty, not removed.
Removing unmodified files from /etc/mailman/sl  done.
Directory /etc/mailman/sl not empty, not removed.
Removing unmodified files from /etc/mailman/pt  done.
Directory /etc/mailman/pt not empty, not removed.
Removing unmodified files from /etc/mailman/hu  done.
Directory /etc/mailman/hu not empty, not removed.
Removing unmodified files from /etc/mailman/es  done.
Directory /etc/mailman/es not empty, not removed.
Removing unmodified files from /etc/mailman/vi  done.
Directory /etc/mailman/vi not empty, not removed.
Removing unmodified files from /etc/mailman/ko  done.
Directory /etc/mailman/ko not empty, not removed.
Removing unmodified files from /etc/mailman/ro  done.
Directory /etc/mailman/ro not empty, not removed.
Removing unmodified files from /etc/mailman/gl  done.
Directory /etc/mailman/gl not empty, not removed.
Removing unmodified files from /etc/mailman/fa  done.
Directory /etc/mailman/fa not empty, not removed.
Removing unmodified files from /etc/mailman/da  done.
Directory /etc/mailman/da not empty, not removed.
Removing unmodified files from /etc/mailman/pl  done.
Directory /etc/mailman/pl not empty, not removed.
Removing unmodified files from /etc/mailman/ia  done.
Directory /etc/mailman/ia not empty, not removed.
Removing unmodified files from /etc/mailman/uk  done.
Directory /etc/mailman/uk not empty, not removed.
Removing unmodified files from /etc/mailman/sv  done.
Directory /etc/mailman/sv not empty, not removed.
Removing unmodified files from /etc/mailman/ast  done.
Directory /etc/mailman/ast not empty, not removed.
Installing site language en ............................................ done.
Downgrade detected, from version 0x20112f1 to version 0x20110f0
This is probably not safe.
Exiting.
dpkg: error processing package mailman (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 mailman
E: Sub-process /usr/bin/dpkg returned an error code (1)

Estou executando o Ubuntu 14.04.3. Minha pergunta é:

O que causaria isso?

Atualização: O comentário de Per @ Ravan abaixo foi capaz de corrigir o problema por

cd /var/lib/dpkg/info/
rm mailman*
apt-get clean all
apt-get update
apt-get upgrade

Embora as coisas estejam melhores agora, ainda não tenho uma resposta para o que teria causado isso.

    

Answer 1

Depois de excluir todos os arquivos em /var/lib/dpkg/info/ , é difícil dizer qual era o problema.

Portanto, não exclua algo, se precisar de uma explicação para o seu problema. Ou leia este , antes de fazer algo.

O erro ocorreu no arquivo /var/lib/dpkg/info/mailman.postinst , essa foi a mensagem de erro para isso:

  

script de pós-instalação do subprocesso instalado retornou a saída de erro   status 1

E este é o código problemático ou o local a partir do qual alguém poderia procurar o erro.

for lang in ${site_languages}; do
  printf "Installing site language ${lang} " >&2
  mkdir -p ${mm_etc}/${lang}
  for file in $(ls ${mm_dist}/${lang}); do
    printf . >&2
    langfile=${lang}/${file}
    ucf --debconf-ok --three-way ${mm_dist}/${langfile} ${mm_etc}/${langfile} 2>/dev/null
  done
  printf " done.\n" >&2
done

Mais não pode ser determinado, infelizmente.