The Samba update to 2:4.21.0-2.1 breaks Samba so that it no longer works at all.
And error message was output in the nmb status that stated “/usr/lib/libldb.so.2: version `LDB_2.10.0’ not found”
Downgrading smbclient, samba,and libwbclient back to 4.20.4-1.1 fixed the issue.