Systemd and group credentials: failed at GROUP spawning

Recently, one of my servers running Deb 10 stopped responding to everything except SSH. After solving an issue where the filesystem was read-only due to a botched fstab, I am now met with almost all services failing to load, which I've begun to work on one at a time. This is mariadb's failure, which during my Googling, seems to have something to do with systemd and group creds. I don't know where to go from here to find out why these errors are occurring. Could someone tell me what my first step would be in solving this issue? Dec    8 09:03:39 adolf systemd: mariadb.service: Failed to determine group credentials: No such process Dec    8 09:03:39 adolf systemd: mariadb.service: Failed at step GROUP spawning /usr/bin/install: No such process Dec    8 09:03:39 adolf systemd: mariadb.service: Control process exited, code=exited, status=216/GROUP Dec    8 09:03:39 adolf systemd: mariadb.service: Failed with result 'exit-code'. Dec    8 09:03:39 adolf systemd: Failed to start MariaDB 10.3.22 database server. Thanks for the help!