[SOLVED] Only "Dashboard" menu is visible ; other menus disappeared

Help! (Home for newbies)
1

Hello,

I use Virtualmin to set up websites. But after a few days using it, the menu items on the left disappeared. Only “Dashboard” menu is visible.
See print screen: https://pasteboard.co/I1XT8Rj.png

No errors show up, nor in the console.

Logged in as root

System info:

CentOS Linux release 7.6.1810 (Core)

rpm -qa | grep webmin

webmin-1.900-1.noarch

rpm -qa | grep wbm

wbm-virtualmin-awstats-5.6-2.noarch
wbm-jailkit-0.1-1.noarch
wbm-virtualmin-init-2.5-1.noarch
wbm-virtualmin-htpasswd-2.6-1.noarch
wbm-virtualmin-dav-3.8-1.noarch
wbm-ruby-gems-1.4-1.noarch
wbm-php-pear-1.6-1.noarch
wbm-virtualmin-slavedns-1.8-1.noarch
wbm-virtual-server-6.06.gpl-1.noarch
wbm-virtualmin-sqlite-1.4-1.noarch
wbm-virtualmin-git-1.8-1.noarch
wbm-virtualmin-registrar-2.5-1.noarch

Anyone has any idea?

2

[SOLVED]
in the logs (view /var/webmin/miniserv.error), I could see the following:
“Failed to query Postfix config command to get the current value of parameter virtual_alias_maps:”
It appears that by upgrading MariaDB from 5.5 to 10.3, the uninstall of the MariaDB 5.5 removed the postfix package as postfix relies on MariaDB. I went to Webmin > Un-used Modules. Postfix Mail was listed, and there was a button to install the package.