A mechanism to remove winbind from /etc/nsswitch.conf before samba upgrades (since libnss-winbind is kept apart from packages "samba" and "samba-libs"), OR to fail the upgrade if winbind is being used, should exist to prevent such a bad thing to happen.
A mechanism to remove winbind from /etc/nsswitch.conf before samba upgrades (since libnss-winbind is kept apart from packages "samba" and "samba-libs"), OR to fail the upgrade if winbind is being used, should exist to prevent such a bad thing to happen.