I just set up Asterisk 18 on my Ubuntu Server 22.04 and everything works fine. My issuu happen when I try to enable the GUI interface. I can reach the http interface but when I enter the credential it keep loading
Creating a config file to store GUI preferences.
and on the CLI I have this error message
WARNING[41798][C-0000065c]: pbx.c:2934 pbx_extension_helper: No application ‘System’ for extension (asterisk_guitools, executecommand, 1)
Although, Asterisk GUI is long since dead, your actual error means that you didn’t load app_system.so.
There are GUIs for Asterisk, but they are not supported here. FreePBX is one of them but there are others. FreePBX has optional, but frequently used, closed source components, some of which attract licence fees. Others are rather more closed.