Were you re-run iRedMail installer?
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
uname -vr
4.4.0-81-generic #104-Ubuntu SMP Wed Jun 14 08:17:06 UTC 2017
please show me the last few lines of file iRedMail-0.9.7/runtime/install.log?
Seems some file was missed.
cat install.log |tail -15
+ < DEBUG > Configure general settings.
+ < DEBUG > Configure iredadmin database related settings.
+ < DEBUG > Configure SQL mail accounts related settings.
+ < DEBUG > Configure Amavisd related settings.
+ < DEBUG > Configure iRedAPD related settings.
[ INFO ] Configure Fail2ban (authentication failure monitor).
+ < DEBUG > Log into syslog instead of log file.
+ < DEBUG > Disable all default filters in /etc/fail2ban/jail.conf.
+ < DEBUG > Create Fail2ban config file: /etc/fail2ban/jail.local.
+ < DEBUG > Create Fail2ban directory: /etc/fail2ban/jail.d.
+ < DEBUG > Copy modular Fail2ban jail config files to /etc/fail2ban/jail.d.
+ < DEBUG > Copy sample Fail2ban filter config files.
[ INFO ] Configure SOGo Groupware (Webmail, Calendar, Address Book, ActiveSync).
+ < DEBUG > Initialize SOGo database.
+ < DEBUG > Service control: restart sogo.