==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
======== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
======== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.8
- Linux/BSD distribution name and version: Ubuntu 16.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello Zhang,
today after upgrading iRedmail to 0.9.8 and iRedamin Pro to 3.1 there is something wrong with the theme of it,
as per screenshots there is no logo nor background or any kind of images please check attached screenshots.
this is the upgrade log:

 * Detected Linux/BSD distribution: UBUNTU
* HTTP server root: /opt/www
* Found iRedAdmin directory: /opt/www/iredadmin, symbol link of iRedAdmin-Pro-LDAP-3.0
* Found iRedAdmin config file: /opt/www/iredadmin/settings.py
* Copying new version to /opt/www/iRedAdmin-Pro-LDAP-3.1
* Copy /opt/www/iredadmin/settings.py.
* Removing old symbol link /opt/www/iredadmin
* Creating symbol link /opt/www/iredadmin to /opt/www/iRedAdmin-Pro-LDAP-3.1
* Delete all existing sessions, admins are forced to re-login to iRedAdmin.
* Enable mlmmj integration.
awk: warning: escape sequence `\'' treated as plain `''
* Restarting service: mlmmjadmin.
* Check and install dependent Python modules:
  + [required] json or simplejson
  + [required] dnspython
  + [required] pycurl
  + [required] requests
  + [optional] BeautifulSoup
  + [optional] lxml
* Check SQL tables, and add missed ones - if there's any
* iRedAdmin has been successfully upgraded.
* Restarting uwsgi service to use new iRedAdmin release ...
* Upgrading completed.
<<< NOTE >>> If iRedAdmin doesn't work as expected, please post your issue in
<<< NOTE >>> our online support forum: http://www.iredmail.org/forum/

Thanks.