Ubuntu 20.4 CyberPanel installation error

I get such an error while installing Ubuntu 20.4 CyberPanel. please help

have you run apt-get update and upgrade and then reboot
before run the installation script ?

Maybe some system process is stuck. Try to update your system using sudo apt update and then sudo apt upgrade. Then restart the server to kill those stuck processes.
After rebooting try to install again and see.