I did upgrade the packages and repo, and something were upgraded:

BEFORE:
root@gregion83:~# apt-cache policy nova-api | head -n 10
nova-api:
  Installed: 3:29.2.0-0ubuntu1.1
AFTER:

root@gregion83:~# apt-cache policy nova-api | head
nova-api:
  Installed: 3:31.0.0-0ubuntu1.2~cloud0

I also did add "DEBUG=True" under "default" section of /etc/nova/nova.conf in my region and tried to create server, but I cannot find any important logs or details to see what's wrong:

==> /var/log/nova/nova-api.log <==
2025-11-05 14:42:44.524 2960 INFO nova.osapi_compute.wsgi.server [-] 185.137.25.83 "GET /v2.1 HTTP/1.1" status: 200 len: 790 time: 0.0164449
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi [None req-892920aa-c4be-4aea-abab-aa8e9fe8c7e0 64c74c80ec9a4a31ae27b82af846b36a 906db1c682bc4e3db
822c2e6dbc9cb6a - - default default] Unexpected exception in API method: neutronclient.common.exceptions.InternalServerError: Request Failed: internal serve
r error while processing your request.
Neutron server returns request_ids: ['req-80f3ccda-11ee-4417-a27c-2437540e6ee0']

2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi     exception_handler_v20(status_code, error_body)
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi   File "/usr/lib/python3/dist-packages/neutronclient/v2_0/client.py", line 90, in exception_handler_v20
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi     raise client_exc(message=error_message,
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi neutronclient.common.exceptions.InternalServerError: Request Failed: internal server error while processing your request.
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi Neutron server returns request_ids: ['req-80f3ccda-11ee-4417-a27c-2437540e6ee0']
2025-11-05 14:42:45.615 2960 ERROR nova.api.openstack.wsgi
2025-11-05 14:42:45.628 2960 INFO nova.api.openstack.wsgi [None req-892920aa-c4be-4aea-abab-aa8e9fe8c7e0 64c74c80ec9a4a31ae27b82af846b36a 906db1c682bc4e3db822c2e6dbc9cb6a - - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'neutronclient.common.exceptions.InternalServerError'>
2025-11-05 14:42:45.632 2960 INFO nova.osapi_compute.wsgi.server [None req-892920aa-c4be-4aea-abab-aa8e9fe8c7e0 64c74c80ec9a4a31ae27b82af846b36a 906db1c682bc4e3db822c2e6dbc9cb6a - - default default] 185.137.25.83 "GET /v2.1/servers/c18f669d-1338-42dd-947f-c40217238450 HTTP/1.1" status: 500 len: 660 time: 1.1018338

My last openstack version was 6.6.0, and I did upgrade after another email I sent "How to install Flamingo openstack in Ubuntu 24".

Before upgrade, everything was working fine, but now I have issue.

Would you please help me for this?

Regards,

Ahmad