Hi,
I'm running into the same issue on Debian 11 with PHP 8 and MariaDB 10.5.
Installation Method "manual" (downloaded and extracted froxlor-latest.tar.gz, and ran the web-installer).
Debian 11.2
mariadb-server (1:10.5.12-0+deb11u1)
php8.0 (8.0.17-1+0~20220320.31+debian11~1.gbp34e045)
Happy to provide more information if needed, however the forum didn't let me post my terminal output due to spam-protection.
Best regards, Sven.