I can confirm that fail2ban now works as expected.
service fail2ban status
● fail2ban.service - Fail2Ban Service
Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor
preset: enabled)
Active: active (running) since Tue 2022-03-22 16:07:45 GMT; 6s ago
Docs: man:fail2ban(1)
Main PID: 64422 (fail2ban-server)
Tasks: 27 (limit: 38025)
Memory: 16.4M
CPU: 3.890s
CGroup: /system.slice/fail2ban.service
└─64422 /usr/bin/python3 /usr/bin/fail2ban-server -xf start
Mar 22 16:07:45 nova systemd[1]: Started Fail2Ban Service.
Mar 22 16:07:46 nova fail2ban-server[64422]: Server ready
root@nova:/usr/bin# ll python3
lrwxrwxrwx 1 root root 10 Mar 22 16:07 python3 -> python3.10*
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https://bugs.launchpad.net/bugs/1958505
Title:
fail2ban fails to start on 22.04 (cannot import name 'MutableMapping'
from 'collections' py3.10)
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