Indeed, I don't use CBPolicyD, and that's how I proceeded. I ran both commands, the uninstaller and the installer, and AL9 updated without issue.
However, I later saw the following message in my Anacron email, and I'm not sure if it's relevant:
###############################################
Daily MySQL Backup starting
###############################################
(Sorry, I can't post the paths. Notice: the "forbidden" forum is giving an error.)
PHP Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
Database Backup: mysql --> /backup/mysql/daily//mysql.sql.gz
PHP Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
Database Backup: oauthv2 --> /backup/mysql/daily//oauthv2.sql.gz
PHP Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
...
Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
Database Backup: root_cwp --> /backup/mysql/daily//root_cwp.sql.gz
PHP Notice: Trying to access array offset on value of type null in /usr/local/cwpsrv/htdocs/resources/admin/include/cron_backup.php on line 0
...
perl(DBD::mysql) >= 1.0 is needed by percona-toolkit-2.2.16-1.noarch
Currently, I only have the databases included with CWP9, but that last line indicates that it needs perl(DBD::mysql) >= 1.0, precisely the one we replaced. I don't know if it's all related to the replacement.