Virtualmin is telling me that the new SSL certificate is installed from Lets Encrypt.
But the Installatron applications/programs previously installed are still working on http.
Also, I did a test on https://www.sslshopper.com/ssl-checker.html and the response was:
No SSL certificates were found on www.domainname.net. Make sure that the name resolves to the correct server and that the SSL port (default is 443) is open on your server’s firewall.
www.domainname.net resolves to 199.xxx.xx.xx
Server Type: Apache/2.2.22
I’m using Ubintu 12.04, Webmin 1.810 and Virtualmin 5.04gpl - the last two updated yesterday