The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: python3-nova 2:21.2.4-0ubuntu2.4 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-6073-5
https://ubuntu.com/security/notices/USN-6073-1
https://bugs.launchpad.net/cloud-archive/+bug/2019460
https://launchpad.net/ubuntu/+source/nova/2:21.2.4-0ubuntu2.4
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