Comment 2 for bug 728864

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Jelmer Vernooij (jelmer) wrote : Re: package samba4 4.0.0~alpha15~git20110124.dfsg1-2ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Can you try purging the Samba 4 package and installing again? I think one of the earlier versions must have done a broken provision.