I updated ubuntu from 16.04lts to 18.04lts. When I restarted server I got an error when I tried to access to Ispconfig3 control panel. (look at the picture below) I also tried to start PhpMyAdmin an I got only php code (look at the picture below) What went wrong with Ispconfg3 control panel?
Go trough the ispconfig perfect server installation tutorial for Ubuntu and install missing packages. Then do an ispconfig update with reconfigures services = yes.