Hello, I installed my Ubuntu 20.04 system and installed aapanel, but when you log in to private ip to register for the first time on aapanel, I am
sure of a record.
Give me that mistake" this website can't be accessed
188.8.131.52 is currently inaccessible.
First, you need to install firewalld
sudo apt install firewalld
Then open port on firewall (in your case 7800)
sudo firewall-cmd --zone=public --permanent --add-port=7800/tcp
Finally, reload firewall
sudo firewall-cmd --reload