First I updated my ispconfig to the latest version, and it was running fine on Debian 9/stretch. Then I updated Debian 9/stretch to Debian 10/buster and that seemed to go fine/normally. I removed the old php7.0 deb packages and ensured that the php7.3 debs are on the system. But ispconfig won't run -- apache refuses to start, complaining: AH00526: Syntax error on line 58 of /etc/apache2/sites-enabled/... apachectl: Invalid command 'php_admin_value', perhaps misspelled or defined by a module not included in... Anyone have ideas of what could be going wrong? TIA.