(I know it's a old thread, but is just to document the issue)
The error seems is in this line here:
Nov 28 07:55:53 server systemd[1]: Can't open PID file /var/run/pure-ftpd.pid (yet?) after start: Too many levels of symbolic links
It is claiming about "Too many levels of symbolic links" of the PID file.
You tried to run "journalctl -xe" almost 24 minutes after, too late to show logs.
Seems you tried to reinstalled the pure-ftpd server.
Check the permissions of the file '/var/run/pure-ftpd.pid' and the directory.
Removing this file and restarting pure-ftpd server may solve the issue.
If don't, would be good to post here the conf file "/etc/pure-ftpd/pure-ftpd.conf".
Regards,
Netino