aaPanel_Kern after reinstall it is going to work well now. I have trouble with ssh service after update and upgrade.
Maybe it would be helpful if someone loose ssh access - check if there exist folder /run/sshd if not - create it as root and restart ssh service. This helped me to gain access back to server.
My basic troubles started when i choose to install latest version of nginx and other services. So i've changed default install window on first login and after that problem starting. So i reinstall it with default settings for nginx server and after that only ssh problem appear, but it was also solved.
Maybe there is something about Ubuntu that for sure must be done before install aapanel. For now continue to test on one personal server, and if it will be work good enough for half year maybe I will consider to look inside paid version.