I understand, that it is an old thread, but maybe my research will be usefull for someone.

I installed smbfs package and got errors due to bad samba-common configuration process. Then I took /usr/bin/ucfr executable from wheezy debian package, slightly adopted it to eliminate errors under ash, changed /var/lib/dpkg/info/samba-common.postinst, /var/lib/dpkg/info/samba-common.postrm and /var/lib/dpkg/info/smbfs.postinst as it was stated before and issued dpkg --configure samba-common.

Files I changed are in the attachment. Maybe someone will fix the package?