api_test.py test in ubuntu_lxc failed with assertion error (len(ips) > 0) on Mantic

[Po-Hsu Lin]

Issue found on M-6.5

The LXC pyhon3 api test will fail with:
 Running 'python3 /usr/share/doc/python3-lxc/examples/api_test.py'
 Downloading the image index
 Downloading the rootfs
 Downloading the metadata
 The image cache is now ready
 Unpacking the rootfs

 ---
 You just created an Ubuntu xenial amd64 (20231120_07:42) container.

 To enable SSH, run: apt install openssh-server
 No default root or user password are set by LXC.
 Getting instance for 'd053a1ac-8824-11ee-8a40-a8698c04ebf0'
 Creating rootfs using 'download', arch=amd64
 Testing the configuration
 Testing the networking
 Starting the container
 Getting the interface names
 Getting the IP addresses
 Traceback (most recent call last):
   File "/usr/share/doc/python3-lxc/examples/api_test.py", line 135, in
     assert(len(ips) > 0)
            ^^^^^^^^^^^^
 AssertionError