Downloaded the ubuntu 18.04 image; appliance is running fine. Before starting learning and configuring, tried to upgrade with ispconfig_upgrade.sh from the shell. Upgrade is stopping with error: >> Update Operating System: Ubuntu 18.04.4 LTS (Bionic Beaver) This application will update ISPConfig 3 on your server. Shall the script create a ISPConfig backup in /var/backup/ now? (yes,no) [yes]: Creating backup of "/usr/local/ispconfig" directory... Creating backup of "/etc" directory... Checking ISPConfig database .. OK Unable to read server configuration from database. Any help will be appreciated.