NotImplementedError: Your GSSAPI implementation does not have support for manipulating credential stores

[krizex]

What went wrong?

We got the following traceback when using v1.6.7
Note
But when we using v1.6.5, we never met this issue before.

...
File "/usr/local/lib/python3.8/dist-packages/ldap3/core/connection.py", line 587, in bind    response = self.do_sasl_bind(controls)  
File "/usr/local/lib/python3.8/dist-packages/ldap3/core/connection.py", line 1293, in do_sasl_bind    result = sasl_gssapi(self, controls)  
File "/opt/ad-service/adagent/patches/ldap3/kerberos.py", line 114, in sasl_gssapi    creds = gssapi.Credentials(name=gssapi.Name(connection.user), usage='initiate', store=connection.cred_store) if connection.user else None  
File "/usr/local/lib/python3.8/dist-packages/gssapi/creds.py", line 63, in __new__    res = cls.acquire(name, lifetime, mechs, usage,  
File "/usr/local/lib/python3.8/dist-packages/gssapi/creds.py", line 140, in acquire    raise NotImplementedError("Your GSSAPI implementation does "NotImplementedError: Your GSSAPI implementation does not have support for manipulating credential stores

How do we reproduce?

It should be easy to reproduce in Ubuntu 20.04 by installing the packages I listed below.
(Remember to use fenced code blocks and consider placing in a gist if large)

Component versions (python-gssapi, Kerberos, OS / distro, etc.)

(Please include MIT/Heimdal/etc. and how you installed python-gssapi)
Install python-gssapi by pip3 install gssapi
OS: Ubuntu 20.04
KRB5:

root@8040afa9c7fa:/opt/ad-service# apt list --installed | grep krb
libgssapi-krb5-2/focal,now 1.17-6ubuntu4 amd64 [installed,automatic]
libkrb5-26-heimdal/focal,now 7.7.0+dfsg-1ubuntu1 amd64 [installed,automatic]
libkrb5-3/focal,now 1.17-6ubuntu4 amd64 [installed,automatic]
libkrb5support0/focal,now 1.17-6ubuntu4 amd64 [installed,automatic]

Python: 3.8.2

[frozencemetery]

Duplicate of #215; should be resolved now that 1.6.9 is out.