That message should list the other offending package:
ucfr: Attempt from package samba-common to take /etc/samba/smb.conf away from
package <MISSING>
You could take a look what currently owns /etc/samba/smb.conf with "dpkg
-S /etc/samba/smb.conf".
Other than that - to continue to help we would need to understand how to
reproduce this issue, so for now I can only mark it as incomplete.
** Changed in: samba (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1614562
Title:
package samba-common 2:4.3.9+dfsg-0ubuntu0.16.04.3 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 4
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