Comment 4 for bug 873551

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barbobot (deadlyh) wrote : Re: package dictionaries-common 1.11.5ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 255

I was able to fix this by running /usr/share/debconf/fix_db.pl as root as per the document:
/usr/share/doc/dictionaries-common/README.problems