This occurred because of the ucf package you have installed.
ucfr: Attempt from package samba-common to take /etc/samba/smb.conf away from
dpkg: error processing package samba-common (--configure):
subprocess installed post-installation script returned error exit status 4
** Tags added: bot-stop-nagging
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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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