[Samba] Joining Linux Domain Member to Samba DC, issues

[Mark Foley]

I've successfully joined several Linux hosts as Domain Members thus far; 
except for this one particular host that seems to fail in a different 
way each time I try -- I've even scratch-installed this host from 
installation DVD.

All the tests listed in 
https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Domain_Member 
work. My latest attempt is as follows:

# net ads join -U administrator
Password for [HPRS\administrator]:
ldb: unable to dlopen /usr/lib64/ldb/local_password.so : 
/usr/lib64/libsamdb-common-samba4.so: version `SAMBA_4.6.16' not found 
(required by /usr/lib64/ldb/local_password.so)
ldb: unable to dlopen /usr/lib64/ldb/simple_dn.so : 
/usr/lib64/libdsdb-module-samba4.so: version `SAMBA_4.6.16' not found 
(required by /usr/lib64/ldb/simple_dn.so)
ldb: unable to dlopen /usr/lib64/ldb/simple_ldap_map.so : 
/usr/lib64/libsamdb-common-samba4.so: version `SAMBA_4.6.16' not found 
(required by /usr/lib64/ldb/simple_ldap_map.so)
Using short domain name -- HPRS
Joined 'WEBSERVER' to dns domain 'hprs.local'
DNS Update for webserver.hprs.local failed: ERROR_DNS_UPDATE_FAILED
DNS update failed: NT_STATUS_UNSUCCESSFUL

# samba --version
Version 4.18.9

A couple of points of interest: neither the Domain Controller nor the 
other Linux Domain Member on this LAN have the file 
/usr/lib64/ldb/local_password.so. On this problem child, that file is 
dated 11/28/2018. Two other files in that directory have the same date: 
simple_dn.so and simple_ldap_map.so. All the rest of the files in that 
directory have the same dates as the Domain Controller and the other 
Domain Member, 11/30/2023.

My current Samba Version on all three of these computers is 4.18.9. The 
old samba version before upgrading was 4.6.16 -- the very version listed 
above as "SAMBA_4.16.16" not found.

Before I do something stupid, I was to bounce a thought off the 
sambaList experts. I'm theorizing that the previous version of Samba 
(4.6.16) was not completely removed and left some files (like 
local_password.so) laying around.

My proposed solution is to completely uninstall Samba and any and all 
vestiges thereof, and reinstall from scratch.

Does that sound reasonable, or could I just delete these 3 old files and 
try again? Note that this host works fine doing samba shares.

Thanks --Mark