Open Stack

Hi,
I am running Ubuntu Server 20.04 LTS on Virtualbox. I installed OpenStack (Xena release) through Devstack.
Here is the content of my /opt/stack/devstack/local.conf file :
[[local|localrc]]
ADMIN_PASSWORD=secret
DATABASE_PASSWORD=$ADMIN_PASSWORD
RABBIT_PASSWORD=$ADMIN_PASSWORD
SERVICE_PASSWORD=$ADMIN_PASSWORD
HOST_IP=10.0.2.15


I created an instance through Horizon. The security group contains the 
2 rules needed (one to be able to ping and one to be able to ssh the instance). I also allocated and associated a floating IP address.
And a ssh key pair.

Here is the configuration :
openstack server list
---------------------------------+--------------------------+---------+
| ID   | Name | Status | Networks | Image  | Flavor  |
---------------------------------+--------------------------+---------+
| f5f0fdd5-298b-4fa3-9ee9-e6e4288f4327 | InstanceJanvier | ACTIVE | shared=172.24.4.133, 192.168.233.165 | cirros-0.5.2-x86_64-disk | m1.nano |
------------------------------------------------------+


openstack network list : 
------------------------------------------------------+
| ID     | Name    | Subnets             |
------------------------------------------------------+
| 96a04799-7fc7-4525-b05c-ad57261aed38 | public  | 07ce42db-6f3f-4135-ace7-2fc104ea62a0, 6dba13fc-b10c-48b1-b1b4-e1f1afe25b53 |
| c42638dc-fa56-4644-ad34-295fce4811d2 | shared  | a4e2d8cc-02b2-42e2-a525-e0eebbb08980                                       |
| ffb8a527-266e-4e96-ad60-f7e9aba8f0c1 | private | 42e36677-cf3c-4df4-88a1-8cf79b9d6060, e507e6dd-132a-4249-96b1-83761562dd73 |
------------------------------------------------------+

openstack router list :
+--------------------------------------+----------------+--------+------
| ID    | Name  | Status | State | Project                          |
+--------------------------------------+----------------+--------+------
| b9a15051-a532-4c93-95ad-53c057720c62 | Virtual_router | ACTIVE | UP    | 6556c02dd88f4c45b535c2dbb8ba1a04 |
+--------------------------------------+----------------+--------+------


I cannot ping/ssh neither the fixed IP address or the floating IP address : 
ping -c 3 172.24.4.133
PING 172.24.4.133 (172.24.4.133) 56(84) bytes of data.
--- 172.24.4.133 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2035ms

ping -c 3 192.168.233.165
PING 192.168.233.165 (192.168.233.165) 56(84) bytes of data.
--- 192.168.233.165 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2035ms

Maybe that has something to do with the network namespaces configuration on Ubuntu.
Does anyone know what could go wrong or what is missing ?
Thanks for helping.
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