I did the setup for a
ProFTP server on my Ubuntu workstation before-hand, but when replicating it on a Ubuntu server,
mod_sql_passwd is simply missing.
When I enable the module, I get the following error:
Fatal: LoadModule: error loading module 'mod_sql_passwd.c': Permission denied on line 51 of '/etc/proftpd/modules.conf'
mod_sql_passwd files (
.c) are simply missing, whereas on my workstation it was a simple matter of enabling the configuration.
The biggest difference with the server is that it's a release gap. I will be upgrading the server, which is at the latest
LTS release, in case it's the reason why.