Public bug reported:

Summary: the package ldaptor is shipping version 0.0.43, which is from
~2006 (14 years old already). The twisted version from the repos is
16.0.0 (~2016).

The release of Ubuntu I am using is Ubuntu 16.04.6 LTS.
The version of the package I am using is 0.0.43+debian1-7.

What I've expected to happen:
1. Installed the latest available python-ldaptor and latest available 
python-twisted-core packages (it's installed automatically as a dependency).
2. Tried the example server and client code from 
https://ldaptor.readthedocs.io/en/latest/quickstart.html (attached the code 
examples just in case)
3. Example client and server interacts properly, without errors

What happened instead:
2020-02-07 14:15:50+0000 [-] Log opened.
2020-02-07 14:15:50+0000 [-] LDAPServerFactory starting on 8080
2020-02-07 14:15:50+0000 [-] Starting factory <__main__.LDAPServerFactory 
instance at 0x7f310257bc68>
2020-02-07 14:16:10+0000 [LDAPServer,0,127.0.0.1] Unhandled Error
        Traceback (most recent call last):
          File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 
101, in callWithLogger
            return callWithContext({"system": lp}, func, *args, **kw)
          File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 
84, in callWithContext
            return context.call({ILogContext: newCtx}, func, *args, **kw)
          File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", 
line 118, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", 
line 81, in callWithContext
            return func(*args,**kw)
        --- <exception caught here> ---
          File 
"/usr/lib/python2.7/dist-packages/twisted/internet/posixbase.py", line 597, in 
_doReadOrWrite
            why = selectable.doRead()
          File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 
209, in doRead
            return self._dataReceived(data)
          File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 
215, in _dataReceived
            rval = self.protocol.dataReceived(data)
          File 
"/usr/lib/python2.7/dist-packages/ldaptor/protocols/ldap/ldapserver.py", line 
52, in dataReceived
            self.handle(o)
          File 
"/usr/lib/python2.7/dist-packages/ldaptor/protocols/ldap/ldapserver.py", line 
114, in handle
            log.debug('S<-C %s' % repr(msg))
        exceptions.AttributeError: 'module' object has no attribute 'debug'

Steps to reproduce:
1. Run apt-get install python-ldaptor
2. Download the example server.py and client.py (or copy-paste them from 
https://ldaptor.readthedocs.io/en/latest/quickstart.html)
3. Run python2 server.py
4. Run python2 client.py

Additional information:
As far as I can see the package ldaptor is 0.0.43, which is from 2006 (14 years 
old already, info taken from 
https://changelogs.ubuntu.com/changelogs/pool/universe/l/ldaptor/ldaptor_0.0.43+debian1-7/changelog),
 and the latest python-twisted version is 16.0.0 (from the repos), which is 
first seen at 2016 in the repos 
(https://changelogs.ubuntu.com/changelogs/pool/main/t/twisted/twisted_16.0.0-1ubuntu0.2/changelog).
 So, we have at least 10 years of inconsistency between ldaptor and twisted.
As for now, ldaptor uses log.msg() instead of log.debug(), which is simply not 
available in modern twisted, as can be seen in the same code part from the 
modern version of ldaptor: 
https://github.com/twisted/ldaptor/blob/master/ldaptor/protocols/ldap/ldapserver.py#L120,
 and that is the source of the exception.
So, please, update the ldaptor to the modern one. Even the examples are not 
working with such an old version now.

** Affects: ldaptor (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Example code from 
https://ldaptor.readthedocs.io/en/latest/quickstart.html";
   
https://bugs.launchpad.net/bugs/1862367/+attachment/5326262/+files/example.tar.gz

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https://bugs.launchpad.net/bugs/1862367

Title:
  The package version is too old to work with relatively modern Twisted

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