Cannot create subscriptions after Plesk upgrade: hosting update is failed: f2bmng failed: ERROR:__main__:Command '/bin/rpm', '-qf', '--queryformat

Symptoms

• After Plesk upgrade, subscription creation fails:
  

  PLESK_ERROR: hosting update is failed: f2bmng failed: ERROR:__main__:Command '['/bin/rpm', '-qf', '--queryformat', '%{NAME}\\n', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/plesk.conf', '/etc/fail2ban/jail.local']' returned non-zero exit status 1" error occurred.

  or:

  PLESK_ERROR: Error: Unable to get the list of jails: f2bmng failed: ERROR:__main__:Command '['/bin/rpm', '-qf', '--queryformat', '%{NAME}\\n', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/plesk.conf', '/etc/fail2ban/jail.local']' returned non-zero exit status 1.

  The same error appears when accessing Tools & Settings > Fail2ban > Jails tab.

• Duplicate packages can be found in the system:
  

  # rpm -qa | grep fail2ban
  fail2ban-0.10.3.1-2.centos.7+p18.0.29.1+t200807.1333.noarch
  fail2ban-0.10.3.1-2.centos.7+p18.0.23.0+t191224.1303.noarch
  plesk-fail2ban-configurator-18.0-2.centos.7+p18.0.29.1+t200807.1333.noarch
  plesk-fail2ban-configurator-18.0-2.centos.7+p18.0.26.0+t200410.1427.noarch

Cause

Duplicated packages in the RPM database.

Resolution

Remove duplicate packages using a solution from Yum fails to resolve dependencies: package is a duplicate with